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Resolving Structural Origins for Superconductivity in Strain-Engineered La$_3$Ni$_2$O$_7$ Thin Films

T0 review · 3 major / 4 minor · reviewed 2026-08-10 · deepseek-v4-flash

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Pith's one-line read Strained La3Ni2O7 superconductivity tracks in-plane compression and octahedral symmetry, not c-axis shortening.

desk verdict Direct oxygen-sublattice imaging across a strain series is a real advance, but the main causal claim is underdetermined: the proposed structural ingredient appears in both the superconducting and a non-superconducting film. read the letter →

arxiv 2501.08204 v1 pith:S3RJDHJT submitted 2025-01-14 cond-mat.supr-con

Lopa Bhatt , Abigail Y. Jiang , Eun Kyo Ko , Noah Schnitzer , Grace A. Pan , Dan Ferenc Segedin , Yidi Liu , Yijun Yu
show 8 more authors
Yi-Feng Zhao Edgar Abarca Morales Charles M. Brooks Antia S. Botana Harold Y. Hwang Julia A. Mundy David A. Muller Berit H. Goodge
This is my paper · ORCID
classification cond-mat.supr-con
keywords La3Ni2O7bilayernickelatesuperconductivitystrainengineeringmultisliceelectronptychographyoctahedraldistortionsoxygenstoichiometrythinfilms
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The reading

This paper asks which atomic-scale structural changes actually enable superconductivity in strained La3Ni2O7 thin films, a bilayer nickelate that superconducts under high pressure in bulk and above 40 K in compressively strained films. By imaging both cation and oxygen sublattices with picometer resolution across a strain series from -2% to +2%, the authors find that the superconducting film is distinguished not by a compressed c-axis but by in-plane biaxial compression and a lifting of crystalline symmetry toward a higher-symmetry Fmmm-like octahedral pattern. The implication is that the prevailing explanation centered on Ni-dz2 interlayer coupling under c-axis compression needs revision, and the electronic structure may be more cuprate-like than previously assumed. The authors also show that the superconducting film contains mesoscopic oxygen-vacancy inhomogeneity and internal strain near defects, which they suggest broadens the superconducting transition.

What carries the argument

The central measurement is multislice electron ptychography (MEP), a scanning transmission electron microscopy technique that solves the inverse scattering problem to recover the sample potential at deep sub-angstrom resolution, making oxygen columns quantitatively measurable next to heavy cations. The load-bearing order parameter is the Ni-planar O bond angle within each Ni-O2 plane, which distinguishes the unidirectional, high-symmetry Fmmm-like pattern from the alternating Amam pattern. Complementary ADF-STEM imaging and x-ray diffraction give in-plane and c-axis lattice constants, and DFT structural relaxations at constrained in-plane strains reproduce the observed symmetry crossover. The combination lets the paper separate which structural motif—bond tilts, in-plane spacing, or c-axis spacing—correlates with superconductivity.

What would settle it

Measure the local oxygen stoichiometry and superconducting onset in the same few-nanometer regions of the SLAO film; if Fmmm-like domains without oxygen-vacancy signatures are non-superconducting, or if a compressively strained film with Amam-like symmetry still superconducts, the structural assignment does not carry the superconductivity.

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Extended reading notes

Core claim

Using multislice electron ptychography, the paper resolves La, Ni, and O columns in La3Ni2O7 films grown on four substrates spanning compressive to tensile strain. It reports two strain-dependent structural changes. First, under compressive strain the Ni-planar O bond angles are small and unidirectional within each Ni-O2 plane, matching the high-pressure Fmmm (or I4/mmm-like) structure, while tensile films retain the lower-symmetry Amam pattern with alternating bond tilts. Second, the in-plane lattice constant of the superconducting SLAO film matches the bulk value at the critical pressure, whereas its c-axis is expanded, not compressed, compared with bulk superconductors. The paper concludes that superconductivity is not driven by c-axis compression alone and identifies the lifting of crystalline symmetry via modification of nickel-oxygen octahedral distortions under biaxial compression as a key structural ingredient.

Load-bearing premise

The conclusion assumes that the superconductivity of the SLAO film is controlled by its majority Fmmm-like octahedral structure, rather than by oxygen vacancies, minority intergrowths, or defect-driven filamentary paths that differ between films.

Editorial extensions

If this is right

  • Fermi-surface and pairing-symmetry theories built on Ni-dz2 interlayer coupling under c-axis compression need to be revisited; the relevant electronic changes may instead be driven by in-plane bond geometry and a more cuprate-like dx2-y2 band.
  • Strain engineering of La3Ni2O7 should target compressive substrates that stabilize the Fmmm-like octahedral pattern rather than simply minimize the c-axis.
  • Oxygen stoichiometry and defect control are likely limiting the transition width; reducing mesoscopic oxygen-vacancy disorder and internal strain near dislocations and intergrowths could sharpen and raise Tc.
  • The measured in-plane lattice match to the bulk critical pressure suggests a biaxial-pressure equivalence of roughly 10 to 20 GPa, placing film superconductivity near the edge of the bulk superconducting dome.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • If the structural motif is the essential ingredient, similar Fmmm-like octahedral order should also be found in other superconducting bilayer nickelate films, including La2PrNi2O7 and possibly trilayer La4Ni3O10 under equivalent strain.
  • The paper's oxygen-vacancy observations hint that superconducting regions may be spatially inhomogeneous; correlating local Tc with Fmmm-like domains via cryogenic transport microscopy would test whether the transition is filamentary.
  • The proposed cuprate-like electronic structure could be tested directly by measuring the superconducting gap symmetry with phase-sensitive or spectroscopic-imaging experiments on these films.
  • A low-temperature structural transition, analogous to the one reported in bulk high-pressure samples, may also occur in the strained films; cryogenic ptychography could look for an inversion of the planar-O bond orientation below Tc.
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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Referee Report

3 major / 4 minor

Summary. The paper reports atomic-scale structural measurements of strain-engineered La3Ni2O7 thin films using multislice electron ptychography (MEP) across substrates that impose biaxial strains from -2% to +1.9%. The authors measure Ni-planar O bond-angle patterns and lattice constants, and compare them with bulk high-pressure structures and DFT relaxations. They find that compressively strained films (SLAO, LAO) exhibit unidirectional planar-oxygen displacements and no half-order superlattice peaks, consistent with an Fmmm-like symmetry, while tensile-strained films (NGO, STO) show alternating displacements and Amam-like symmetry. The superconducting SLAO film has an in-plane lattice constant matching bulk samples at the critical pressure, but an expanded c-axis. The authors conclude that superconductivity is not driven by c-axis compression alone and propose in-plane compression and the lifting of octahedral symmetry as key structural ingredients.

Significance. The MEP measurements provide a valuable direct, real-space view of oxygen positions in a correlated oxide, with picometer-level precision, and the systematic strain series is a useful platform for separating structural motifs. The comparison with independent DFT relaxations and external bulk refinements is a strength. If the causal interpretation held, the work would substantially refocus theoretical efforts away from c-axis compression and Ni-dz2-driven pairing toward in-plane compression and cuprate-like physics. However, the central claim is currently underdetermined: the proposed 'key structural ingredient' is present in both the single superconducting film and a non-superconducting control, and oxygen stoichiometry is not quantified per film. These limitations are acknowledged in the text but not fully incorporated into the conclusions.

major comments (3)
  1. [Strain-dependent Ni-O bond symmetry (Fig. 2a,b,e; Table S2)] The paper's headline claim that lifting of crystalline symmetry through octahedral-distortion modification is 'a key structural ingredient for superconductivity' is not supported by the comparison shown. The SLAO film (superconducting) and the LAO film (metallic, non-superconducting) both exhibit the same unidirectional planar-O pattern and both lack half-order superlattice peaks, and their mean Ni-planar O bond angles (1.7 +/- 1.2 deg and 1.4 +/- 1.0 deg, Table S2) are statistically indistinguishable. Thus the measured symmetry change is shared by a superconducting and a non-superconducting film, so the data cannot establish that this structural motif is sufficient or uniquely responsible for superconductivity; it may simply be a correlate of compressive strain. The authors should either soften the causal claim to a correlation, or provide additional discriminating evidence (e.g., a compressive-strain film without the Fmmm-like symmetry, or a systematic exploration of the strain window that the paper admits is not yet established).
  2. [Methods (Thin film synthesis) and Fig. 4d,e] The causal attribution is also confounded by unquantified oxygen stoichiometry. The Methods state that 'precise quantification of oxygen stoichiometry in both thin films and bulk crystals is experimentally challenging,' and Fig. 4d shows mesoscopic oxygen-vacancy inhomogeneity within the superconducting SLAO film, with one region lacking the O-K pre-peak. No per-film oxygen content is reported for the series. Since bulk La3Ni2O7 is insulating when oxygen-deficient (Refs. 47-49), and the SLAO film required ozone annealing to superconduct (Ref. 6), differences in oxygen content or defect density between films could explain part or all of the electronic differences attributed to strain. The authors should explicitly discuss this confound in the conclusions and, ideally, provide an oxygen-content measure for each film or restrict the claims to the measured structural correlations.
  3. [Discussion and Conclusion (paragraph 2 of 'Secondary phases...' and concluding paragraph)] The paper states that 'the critical compressive strain required to stabilize superconductivity in La3Ni2O7 thin films has yet to be systematically established,' yet the abstract and conclusion present the symmetry-lifting as the key ingredient. These statements are in tension. The manuscript would be strengthened by framing the results as identifying a candidate structural motif that correlates with superconductivity in the one available superconducting film, while explicitly listing the alternative explanations (strain magnitude, oxygen stoichiometry, defect density) that the current data cannot exclude.
minor comments (4)
  1. [Throughout] The term 'Ni-planar O bond angle' is used frequently but defined only by reference to Supplemental Fig. S5/S7. A brief definition in the main text would improve readability.
  2. [Fig. 2f] The two-Gaussian fits to the bond-angle histograms are shown, but without the residuals in the main figure; the residuals are relegated to Fig. S10. Consider showing the fit quality in the main panel or explicitly citing the residual plot.
  3. [Fig. 3] The comparison between thin-film lattice constants and bulk values at the critical pressure would benefit from error bars on the bulk values or a clear statement that the dashed lines represent reported values without uncertainties.
  4. [Page 4, line 1 of 'Strain-dependent Ni-O bond symmetry'] The phrase 'the variability of crystalline symmetries reported highlights the experimental difficulty...' is slightly awkward. Consider rephrasing for clarity.

Circularity Check

0 steps flagged · score 0.0 of 10

No significant circularity: the structural measurements are self-contained and benchmarked against external bulk refinements and independent DFT relaxations; stated limitations underdetermine causation but do not create a circular derivation.

full rationale

The paper's derivation is a measurement-and-comparison chain rather than a fit-and-predict chain. Strain-dependent Ni-planar O bond angles and lattice constants are directly measured by MEP, ADF-STEM, and XRD, then compared with external bulk refinements (Sun et al., Wang et al.) and with DFT relaxations performed in this work. No parameter is fitted to the superconducting outcome: the superconductivity of the SLAO film is an independent published result (Ko et al., Ref. 6) that is also reproduced in Fig. 1c, so the self-citation is not load-bearing. The manuscript itself flags the key limitations: precise oxygen stoichiometry quantification is described as 'experimentally challenging' (Methods, Thin film synthesis), and the critical compressive strain window 'has yet to be systematically established' (Section 'Secondary phases and their impact on superconductivity'). These limitations, together with the non-superconducting LAO film showing the same Fmmm-like planar-O pattern, weaken the causal attribution, but that is an inference gap rather than a circular reduction. No quoted equation, fitted parameter, or cited uniqueness theorem is shown to be equivalent to the conclusion by construction, so no circular step is identified.

Assumptions & free parameters 0 free parameters · 3 assumptions · 0 invented entities

The central measurement is direct, but the interpretation imports several domain assumptions: ptychographic fidelity for oxygen positions, validity of the bulk reference structures, near-stoichiometric oxygen in all films, and strain as the dominant variable. No new entities are introduced and no free parameters are fit to force the result.

assumptions (3)
  • domain assumption MEP reconstructions faithfully recover oxygen column positions at the precision needed for 1-2 degree bond angle differences.
    Enters in the bond angle analysis (Fig. 2); the paper acknowledges projection complications for apical O and uses planar O instead, but no independent calibration against a known standard is provided.
  • domain assumption Bulk high-pressure structural models (Fmmm and Amam) from Refs. 2 and 34 are accurate reference points.
    The comparison of thin-film structures to these bulk refinements underpins the claim that SLAO films reproduce the superconducting bulk state via in-plane lattice constant.
  • domain assumption All films have near-stoichiometric oxygen, so electronic differences are attributable to strain.
    Methods state oxygen stoichiometry quantification is experimentally challenging; the paper reports no per-film oxygen content and shows oxygen vacancy inhomogeneity in the SLAO film (Fig. 4d).

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Pith. "Pith review of Resolving Structural Origins for Superconductivity in Strain-Engineered La$_3$Ni$_2$O$_7$ Thin Films." pith.science (2026). https://pith.science/paper/S3RJDHJT

@misc{pith2026250108204,
  author       = {Pith},
  title        = {Pith review of: Resolving Structural Origins for Superconductivity in Strain-Engineered La$_3$Ni$_2$O$_7$ Thin Films},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/S3RJDHJT}},
  note         = {Machine review of arXiv:2501.08204}
}
abstract

The discovery of high-temperature superconductivity in bulk La$_3$Ni$_2$O$_7$ under high hydrostatic pressure and, more recently, biaxial compression in epitaxial thin films has ignited significant interest in understanding the interplay between atomic and electronic structure in these compounds. Subtle changes in the nickel-oxygen bonding environment are thought to be key drivers for stabilizing superconductivity, but specific details of which bonds and which modifications are most relevant remains so far unresolved. While direct, atomic-scale structural characterization under hydrostatic pressure is beyond current experimental capabilities, static stabilization of strained La$_3$Ni$_2$O$_7$ films provides a platform well-suited to investigation with new picometer-resolution electron microscopy methods. Here, we use multislice electron ptychography to directly measure the atomic-scale structural evolution of La$_3$Ni$_2$O$_7$ thin films across a wide range of biaxial strains tuned via substrate. By resolving both the cation and oxygen sublattices, we study strain-dependent evolution of atomic bonds, providing the opportunity to isolate and disentangle the effects of specific structural motifs for stabilizing superconductivity. We identify the lifting of crystalline symmetry through modification of the nickel-oxygen octahedral distortions under compressive strain as a key structural ingredient for superconductivity. Rather than previously supposed $c$-axis compression, our results highlight the importance of in-plane biaxial compression in superconducting thin films, which suggests an alternative -- possibly cuprate-like -- understanding of the electronic structure. Identifying local regions of inhomogeneous oxygen stoichiometry and high internal strain near crystalline defects, we suggest potential pathways for improving the sharpness and temperature of the superconducting transition.

Figures

Figures reproduced from arXiv: 2501.08204 by the authors.

Figure 1
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Figure 2
Figure 2. FIG. 2 [PITH_FULL_IMAGE:figures/full_fig_p008_2.png] view at source ↗
Figure 3
Figure 3. FIG. 3 [PITH_FULL_IMAGE:figures/full_fig_p011_3.png] view at source ↗
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Figure 4
Figure 4. Figure 4: FIG. 4 [PITH_FULL_IMAGE:figures/full_fig_p012_4.png]

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Forward citations

Cited by 12 Pith papers

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  1. Spin correlations in La$_3$Ni$_2$O$_7$ thin films

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    RIXS on strained La3Ni2O7 films shows the interlayer exchange Jz is enhanced under compressive strain (superconducting films) and suppressed under tensile strain, supporting spin-fluctuation-mediated interlayer pairing.

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  4. Role of correlations in Ruddlesden-Popper bilayer nickelates under compressive strain

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    In a bilayer two-orbital t-J model for La3Ni2O7, the leading pairing is either extended s-wave or d_{x^2-y^2}-wave, and moving the z2 bonding band through the Fermi level switches the dominant pairing orbital from z2 ...

  9. Structural and Electronic Evolution of Bilayer Nickelates Under Biaxial Strain

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Reference graph

Works this paper leans on

60 extracted references · 51 canonical work pages · cited by 12 Pith papers

  1. [1]

    For consistency, we use the lattice convention shown in Fig

    Here, negative (positive) values denote compressive (tensile) strain. For consistency, we use the lattice convention shown in Fig. 1a where c is the long axis along the layer stacking direction and refer to nominal strain values for simplicity. Films grown on SLAO, LAO, and NGO yield high-quality crystalline Ruddlesden-Popper nickelates with intermit- ten...

    work page 2022

  2. [2]

    D. Li, K. Lee, B. Y. Wang, M. Osada, S. Crossley, H. R. Lee, Y. Cui, Y. Hikita, and H. Y. Hwang, Superconductivity in an infinite-layer nickelate, Nature 572, 624–627 (2019)

    work page 2019

  3. [3]

    H. Sun, M. Huo, X. Hu, J. Li, Z. Liu, Y. Han, L. Tang, Z. Mao, P. Yang, B. Wang, J. Cheng, D.-X. Yao, G.-M. Zhang, and M. Wang, Signatures of superconductivity near 80 K in a nickelate under high pressure, Nature 621, 493–498 (2023)

    work page 2023

  4. [4]

    Y. Zhu, D. Peng, E. Zhang, B. Pan, X. Chen, L. Chen, H. Ren, F. Liu, Y. Hao, N. Li, Z. Xing, F. Lan, J. Han, J. Wang, D. Jia, H. Wo, Y. Gu, Y. Gu, L. Ji, W. Wang, H. Gou, Y. Shen, T. Ying, X. Chen, W. Yang, H. Cao, C. Zheng, Q. Zeng, J.-g. Guo, and J. Zhao, Superconductivity in pressurized trilayer La 4Ni3O10−δ single crystals, Nature 631, 531–536 (2024)

    work page 2024

  5. [5]

    N. Wang, G. Wang, X. Shen, J. Hou, J. Luo, X. Ma, H. Yang, L. Shi, J. Dou, J. Feng, J. Yang, Y. Shi, Z. Ren, H. Ma, P. Yang, Z. Liu, Y. Liu, H. Zhang, X. Dong, Y. Wang, K. Jiang, J. Hu, S. Nagasaki, K. Kitagawa, S. Calder, J. Yan, J. Sun, B. Wang, R. Zhou, Y. Uwatoko, and J. Cheng, Bulk high-temperature superconductivity in pressurized tetragonal La 2PrNi...

    2024

  6. [6]

    Zhang, D

    Y. Zhang, D. Su, Y. Huang, Z. Shan, H. Sun, M. Huo, K. Ye, J. Zhang, Z. Yang, Y. Xu, Y. Su, R. Li, M. Smidman, M. Wang, L. Jiao, and H. Yuan, High-temperature superconductivity with zero resistance and strange-metal behaviour in La 3Ni2O7−δ, Nature Physics 20, 1269–1273 (2024)

    work page 2024

  7. [7]

    E. K. Ko, Y. Yu, Y. Liu, L. Bhatt, J. Li, V. Thampy, C.-T. Kuo, B. Y. Wang, Y. Lee, K. Lee, J.-S. Lee, B. H. Goodge, D. A. Muller, and H. Y. Hwang, Signatures of ambient pressure superconductivity in thin film La 3Ni2O7, Nature (2024)

    work page 2024

  8. [8]

    G. Zhou, W. Lv, H. Wang, Z. Nie, Y. Chen, Y. Li, H. Huang, W. Chen, Y. Sun, Q.-K. Xue, and Z. Chen, Ambient-pressure superconductivity onset above 40 K in bilayer nickelate ultrathin films, arXiv:2412.16622 (2024)

    arXiv 2024

Show all 60 references
  1. [9]

    B. Y. Wang, K. Lee, and B. H. Goodge, Experimental progress in superconducting nickelates, Annual Review of Condensed Matter Physics 15 (2024)

    2024

  2. [10]

    G. A. Pan, D. Ferenc Segedin, H. LaBollita, Q. Song, E. M. Nica, B. H. Goodge, A. T. Pierce, S. Doyle, S. Novakov, D. C´ ordova Carrizales, A. T. N’Diaye, P. Shafer, H. Paik, J. T. Heron, 19 J. A. Mason, A. Yacoby, L. F. Kourkoutis, O. Erten, C. M. Brooks, A. S. Botana, and J....

    2022

  3. [11]

    X. Wu, D. Di Sante, T. Schwemmer, W. Hanke, H. Y. Hwang, S. Raghu, and R. Thomale, Robust dx2−y2-wave superconductivity of infinite-layer nickelates, Physical Review B 101, 060504 (2020)

    2020

  4. [12]

    X. Ding, Y. Fan, X. Wang, C. Li, Z. An, J. Ye, S. Tang, M. Lei, X. Sun, N. Guo, Z. Chen, S. Sangphet, Y. Wang, H. Xu, R. Peng, and D. Feng, Cuprate-like electronic structures in infinite-layer nickelates with substantial hole dopings, National Science Review 11, nwae194 (2024)

    2024

  5. [13]

    W. Sun, Z. Jiang, C. Xia, B. Hao, Y. Li, S. Yan, M. Wang, H. Liu, J. Ding, J. Liu, Z. Liu, J. Liu, H. Chen, D. Shen, and Y. Nie, Electronic structure of superconducting infinite-layer lanthanum nickelates, arXiv:2403.07344 (2024)

    2024 arXiv

  6. [14]

    Cheng, D

    B. Cheng, D. Cheng, K. Lee, L. Luo, Z. Chen, Y. Lee, B. Y. Wang, M. Mootz, I. E. Perakis, Z.-X. Shen, H. Y. Hwang, and J. Wang, Evidence ford-wave superconductivity of infinite-layer nickelates from low-energy electrodynamics, Nature Materials 23, 775 (2024)

    2024

  7. [15]

    B. H. Goodge, D. Li, K. Lee, M. Osada, B. Y. Wang, G. A. Sawatzky, H. Y. Hwang, and L. F. Kourkoutis, Doping evolution of the Mott–Hubbard landscape in infinite-layer nickelates, Proceedings of the National Academy of Sciences 118 (2021)

    2021

  8. [16]

    K. Lee, B. Y. Wang, M. Osada, B. H. Goodge, T. C. Wang, Y. Lee, S. Harvey, W. J. Kim, Y. Yu, C. Murthy, S. Raghu, L. F. Kourkoutis, and H. Y. Hwang, Linear-in-temperature resistivity for optimally superconducting (Nd, Sr)NiO 2, Nature 619, 288–292 (2023)

    2023

  9. [17]

    Z. Luo, X. Hu, M. Wang, W. W´ u, and D.-X. Yao, Bilayer two-orbital model of La 3Ni2O7 under pressure, Physical Review Letters 131, 126001 (2023)

    2023

  10. [18]

    Zhang, L.-F

    Y. Zhang, L.-F. Lin, A. Moreo, and E. Dagotto, Electronic structure, dimer physics, orbital- selective behavior, and magnetic tendencies in the bilayer nickelate superconductor La 3Ni2O7 under pressure, Physical Review B 108, L180510 (2023)

    2023

  11. [19]

    Sakakibara, N

    H. Sakakibara, N. Kitamine, M. Ochi, and K. Kuroki, Possible high Tc superconductivity in La3Ni2O7 under high pressure through manifestation of a nearly half-filled bilayer Hubbard model, Physical Review Letters 132, 106002 (2024). 20

    2024

  12. [20]

    Christiansson, F

    V. Christiansson, F. Petocchi, and P. Werner, Correlated electronic structure of La 3Ni2O7 under pressure, Physical Review Letters 131, 206501 (2023)

    2023

  13. [21]

    Lechermann, J

    F. Lechermann, J. Gondolf, S. B¨ otzel, and I. M. Eremin, Electronic correlations and super- conducting instability in La 3Ni2O7 under high pressure, Physical Review B 108, L201121 (2023)

    2023

  14. [22]

    C. Lu, Z. Pan, F. Yang, and C. Wu, Interlayer-coupling-driven high-temperature supercon- ductivity in La 3Ni2O7 under pressure, Physical Review Letters 132, 146002 (2024)

    2024

  15. [23]

    Q.-G. Yang, D. Wang, and Q.-H. Wang, Possible s±-wave superconductivity in La 3Ni2O7, Physical Review B 108, L140505 (2023)

    2023

  16. [24]

    H. Liu, C. Xia, S. Zhou, and H. Chen, Role of crystal-field-splitting and longe-range-hoppings on superconducting pairing symmetry of La 3Ni2O7, arXiv:2311.07316 (2023)

    2023 arXiv

  17. [25]

    Zhang, L.-F

    Y. Zhang, L.-F. Lin, A. Moreo, T. A. Maier, and E. Dagotto, Structural phase transition, s ±- wave pairing, and magnetic stripe order in bilayered superconductor La3Ni2O7 under pressure, Nature Communications 15, 2470 (2024)

    2024

  18. [26]

    Y. Meng, Y. Yang, H. Sun, S. Zhang, J. Luo, L. Chen, X. Ma, M. Wang, F. Hong, X. Wang, and X. Yu, Density-wave-like gap evolution in La 3Ni2O7 under high pressure revealed by ultrafast optical spectroscopy, Nature Communications 15, 10408 (2024)

    2024

  19. [27]

    L. C. Rhodes and P. Wahl, Structural routes to stabilize superconducting La3Ni2O7 at ambient pressure, Physical Review Materials 8, 044801 (2024)

    2024

  20. [28]

    Geisler, J

    B. Geisler, J. J. Hamlin, G. R. Stewart, R. G. Hennig, and P. J. Hirschfeld, Fermi surface reconstruction in strained La 3Ni2O7 on LaAlO 3(001) and SrTiO 3(001), arXiv: 2411.14600 (2024)

    2024

  21. [29]

    Zhao and A

    Y.-F. Zhao and A. S. Botana, Electronic structure of Ruddlesden-Popper nickelates: strain to mimic the effects pressure, arXiv:2412.04391 (2024)

    2024 arXiv

  22. [30]

    Z. Luo, B. Lv, M. Wang, W. W´ u, and D.-X. Yao, High- tc superconductivity in La 3Ni2O7 based on the bilayer two-orbital t-J model, npj Quantum Materials 9, 61 (2024)

    2024

  23. [31]

    Z. Chen, Y. Jiang, Y.-T. Shao, M. E. Holtz, M. Odstrˇ cil, M. Guizar-Sicairos, I. Hanke, S. Gan- schow, D. G. Schlom, and D. A. Muller, Electron ptychography achieves atomic-resolution limits set by lattice vibrations, Science 372, 826 (2021)

    2021

  24. [32]

    Z. Dong, M. Huo, J. Li, J. Li, P. Li, H. Sun, Y. Lu, M. Wang, Y. Wang, and Z. Chen, Visualization of oxygen vacancies and self-doped ligand holes in La3Ni2O7−δ, Nature 630, 847 21 (2023)

    2023

  25. [33]

    Ferenc Segedin, B

    D. Ferenc Segedin, B. H. Goodge, G. A. Pan, Q. Song, H. LaBollita, M.-C. Jung, H. El-Sherif, S. Doyle, A. Turkiewicz, N. K. Taylor, J. A. Mason, A. T. N’Diaye, H. Paik, I. E. Baggari, A. S. Botana, L. F. Kourkoutis, C. M. Brooks, and J. A. Mundy, Limits to the strain engineeri...

    2023

  26. [34]

    T. Cui, S. Choi, T. Lin, C. Liu, G. Wang, N. Wang, S. Chen, H. Hong, D. Rong, Q. Wang, Q. Jin, J.-O. Wang, L. Gu, C. Ge, C. Wang, J.-G. Cheng, Q. Zhang, L. Si, K.-J. Jin, and E.- J. Guo, Strain-mediated phase crossover in Ruddlesden–Popper nickelates, Communications Materials ...

    2024

  27. [35]

    L. Wang, Y. Li, S.-Y. Xie, F. Liu, H. Sun, C. Huang, Y. Gao, T. Nakagawa, B. Fu, B. Dong, Z. Cao, R. Yu, S. I. Kawaguchi, H. Kadobayashi, M. Wang, C. Jin, H. kwang Mao, and H. Liu, Structure responsible for the superconducting state in La 3Ni2O7 at high-pressure and low-temper...

    2024

  28. [36]

    J. Li, P. Ma, H. Zhang, X. Huang, C. Huang, M. Huo, D. Hu, Z. Dong, C. He, J. Liao, X. Chen, T. Xie, H. Sun, and M. Wang, Pressure-driven right-triangle shape superconductivity in bilayer nickelate La3Ni2O7, arXiv:2404.11369 (2024)

    2024 arXiv

  29. [37]

    X. Zhou, W. He, Z. Zhou, K. Ni, M. Huo, D. Hu, Y. Zhu, E. Zhang, Z. Jiang, S. Zhang, S. Su, J. Jiang, Y. Yan, Y. Wang, D. Shen, X. Liu, J. Zhao, M. Wang, M. Liu, Z. Du, and D. Feng, Revealing nanoscale structural phase separation in La 3Ni2O7−δ single crystal via scanning near...

    2024 arXiv

  30. [38]

    P. Gao, A. Kumamoto, R. Ishikawa, N. Lugg, N. Shibata, and Y. Ikuhara, Picometer-scale atom position analysis in annular bright-field STEM imaging, Ultramicroscopy 184, 177 (2018)

    2018

  31. [39]

    B¨ urger, T

    J. B¨ urger, T. Riedl, and J. K. Lindner, Influence of lens aberrations, specimen thickness and tilt on differential phase contrast STEM images, Ultramicroscopy 219, 113118 (2020)

    2020

  32. [40]

    Jiang, Z

    Y. Jiang, Z. Chen, Y. Han, P. Deb, H. Gao, S. Xie, P. Purohit, M. W. Tate, J. Park, S. M. Gruner, V. Elser, and D. A. Muller, Electron ptychography of 2D materials to deep sub- ˚Angstr¨ om resolution, Nature559, 343 (2018)

    2018

  33. [41]

    Bianco and L

    E. Bianco and L. F. Kourkoutis, Atomic-resolution cryogenic scanning transmission electron microscopy for quantum materials, Accounts of Chemical Research 54, 3277 (2021). 22

    2021

  34. [42]

    G. Wang, N. N. Wang, X. L. Shen, J. Hou, L. Ma, L. F. Shi, Z. A. Ren, Y. D. Gu, H. M. Ma, P. T. Yang, Z. Y. Liu, H. Z. Guo, J. P. Sun, G. M. Zhang, S. Calder, J.-Q. Yan, B. S. Wang, Y. Uwatoko, and J.-G. Cheng, Pressure-induced superconductivity in polycrystalline La2PrNi2O7−δ...

    2024

  35. [43]

    J. Kim, J. Mun, C. M. Palomares Garc ´ ıa, B. Kim, R. S. Perry, Y. Jo, H. Im, H. G. Lee, E. K. Ko, S. H. Chang, S. B. Chung, M. Kim, J. W. A. Robinson, S. Yonezawa, Y. Maeno, L. Wang, and T. W. Noh, Superconducting Sr 2RuO4 thin films without out-of-phase boundaries by higher-...

    2021

  36. [44]

    Puphal, P

    P. Puphal, P. Reiss, N. Enderlein, Y.-M. Wu, G. Khaliullin, V. Sundaramurthy, T. Priessnitz, M. Knauft, A. Suthar, L. Richter, M. Isobe, P. A. van Aken, H. Takagi, B. Keimer, Y. E. Suyolcu, B. Wehinger, P. Hansmann, and M. Hepting, Unconventional crystal structure of the high-...

    2024

  37. [45]

    X. Chen, J. Zhang, A. S. Thind, S. Sharma, H. LaBollita, G. Peterson, H. Zheng, D. P. Phelan, A. S. Botana, R. F. Klie, and J. F. Mitchell, Polymorphism in the Ruddlesden–Popper nickelate La 3Ni2O7: discovery of a hidden phase with distinctive layer stacking, Journal of the Am...

    2024

  38. [46]

    H. Wang, L. Chen, A. Rutherford, H. Zhou, and W. Xie, Long-range structural order in a hidden phase of Ruddlesden–Popper bilayer nickelate La3Ni2O7, Inorganic Chemistry 63, 5020 (2024)

    2024

  39. [47]

    F. Li, N. Guo, Q. Zheng, Y. Shen, S. Wang, Q. Cui, C. Liu, S. Wang, X. Tao, G.-M. Zhang, and J. Zhang, Design and synthesis of three-dimensional hybrid Ruddlesden-Popper nickelate single crystals, Physical Review Materials 8, 053401 (2024)

    2024

  40. [48]

    Zhang, M

    Z. Zhang, M. Greenblatt, and J. Goodenough, Synthesis, structure, and properties of the layered perovskite La3Ni2O7−δ, Journal of Solid State Chemistry 108, 402 (1994)

    1994

  41. [49]

    Taniguchi, T

    S. Taniguchi, T. Nishikawa, Y. Yasui, Y. Kobayashi, J. Takeda, S.-I. Shamoto, and M. Sato, Transport, magnetic and thermal properties of La 3Ni2O7−δ, Journal of the Physical Society of Japan 64, 1644 (1995)

    1995

  42. [50]

    Kobayashi, S

    Y. Kobayashi, S. Taniguchi, M. Kasai, M. Sato, T. Nishioka, and M. Kontani, Transport and magnetic properties of La3Ni2O7−δ and La4Ni3O10−δ, Journal of the Physical Society of Japan 65, 3978 (1996). 23

    1996

  43. [51]

    L. F. Kourkoutis, H. Xin, T. Higuchi, Y. Hotta, J. Lee, Y. Hikita, D. Schlom, H. Hwang, and D. Muller, Atomic-resolution spectroscopic imaging of oxide interfaces, Philosophical Magazine 90, 4731 (2010)

    2010

  44. [52]

    Y. F. Nie, Y. Zhu, C.-H. Lee, L. F. Kourkoutis, J. A. Mundy, J. Junquera, P. Ghosez, D. J. Baek, S. Sung, X. X. Xi, K. M. Shen, D. A. Muller, and D. G. Schlom, Atomically precise interfaces from non-stoichiometric deposition, Nature Communications 5, 4530 (2014)

    2014

  45. [53]

    J. B. Nelson and D. P. Riley, An experimental investigation of extrapolation methods in the derivation of accurate unit-cell dimensions of crystals, Proceedings of the Physical Society 57, 160 (1945)

    1945

  46. [54]

    H. T. Philipp, M. W. Tate, K. S. Shanks, L. Mele, M. Peemen, P. Dona, R. Hartong, G. van Veen, Y.-T. Shao, Z. Chen, J. Thom-Levy, D. A. Muller, and S. M. Gruner, Very-high dynamic range, 10,000 frames/second pixel array detector for electron microscopy, Microscopy and Microana...

    2022

  47. [55]

    Thibault and M

    P. Thibault and M. Guizar-Sicairos, Maximum-likelihood refinement for coherent diffractive imaging, New Journal of Physics 14, 063004 (2012)

    2012

  48. [56]

    Wakonig, H.-C

    K. Wakonig, H.-C. Stadler, M. Odstrˇ cil, E. H. Tsai, A. Diaz, M. Holler, I. Usov, J. Raabe, A. Menzel, and M. Guizar-Sicairos, Ptychoshelves, a versatile high-level framework for high- performance analysis of ptychographic data, Journal of Applied Crystallography 53, 574 (2020)

    2020

  49. [57]

    Thibault and A

    P. Thibault and A. Menzel, Reconstructing state mixtures from diffraction measurements, Nature 494, 68 (2013)

    2013

  50. [58]

    Z. Chen, M. Odstrcil, Y. Jiang, Y. Han, M.-H. Chiu, L.-J. Li, and D. A. Muller, Mixed-state electron ptychography enables sub- ˚Angstr¨ om resolution imaging with picometer precision at low dose, Nature Communications 11, 2994 (2020)

    2020

  51. [59]

    Zhang, Y.-T

    C. Zhang, Y.-T. Shao, Z. Baraissov, C. J. Duncan, A. Hanuka, A. L. Edelen, J. M. Maxson, and D. A. Muller, Bayesian optimization for multi-dimensional alignment: tuning aberration correctors and ptychographic reconstructions, Microscopy and Microanalysis 28, 3146 (2022)

    2022

  52. [60]

    distortions

    H. Wang, L. Chen, A. Rutherford, H. Zhou, and W. Xie, Long-range structural order in a hidden phase of Ruddlesden–Popper bilayer nickelate La 2PrNi2O7, Inorganic Chemistry 63, 5020 (2024). 24 SUPPLEMENT AL INFORMA TION TABLE S1. Experimentally measured structural parameters fo...

    2024

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Reviewed August 10, 2026 · model on record in the stance chip above.