pith. sign in

arxiv: 2604.13875 · v1 · submitted 2026-04-15 · ❄️ cond-mat.supr-con

Controlling the Band Filling and the Band Width in Nickelate Superconductors

M. Kriener , C. Terakura , A. Kikkawa , Z. Liu , H. Murayama , M. Nakajima , Y. Fujishiro , S. Sasano
show 4 more authors
R. Ishikawa N. Shibata Y. Tokura Y. Taguchi
This is my paper

Pith reviewed 2026-05-10 12:15 UTC · model grok-4.3

classification ❄️ cond-mat.supr-con
keywords nickelate superconductorsLa3Ni2O7high pressuresuperconductivityband fillingband widthdensity wavesoctahedra tilting
0
0 comments X

The pith

Increasing the tilt of nickel-oxygen octahedra shifts nickelate superconductivity to higher pressures while hole doping reverses the shift.

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

The paper explores how structural tilting of NiO6 octahedra and hole doping can independently tune band width and band filling in bilayer nickelates. High-pressure synthesis and transport measurements show that greater octahedra tilting pushes the superconducting phase to higher pressures, but adding holes counteracts this and restores superconductivity at lower pressures. In the normal state, the authors detect up to three distinct anomalies that may correspond to density-wave orders whose pressure dependencies differ. This controlled variation isolates the role of electronic band parameters in determining the boundaries between superconductivity and other ordered phases.

Core claim

By synthesizing bilayer nickelates with varying NiO6 octahedra tilting and hole doping under high pressure, the authors find that increased tilting shifts the superconducting dome to higher pressures whereas simultaneous hole doping reverts this trend and stabilizes superconductivity at lower pressures. Up to three transport anomalies appear in the nonsuperconducting state, interpreted as possible signatures of density-wave orders with opposing pressure dependencies.

What carries the argument

High-pressure synthesis combined with hydrostatic transport measurements to vary NiO6 octahedra tilting (band width) and hole doping (band filling) in La3Ni2O7-derived compounds.

If this is right

  • Superconductivity can be tuned across a wider pressure range by combining structural distortion and doping controls.
  • Multiple density-wave-like orders can appear with distinct pressure dependencies in the normal state.
  • High-pressure synthesis reduces impurity phases and allows cleaner access to the intrinsic phase diagram.
  • The competition between superconductivity and other orders depends on the relative positions of band width and filling.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • The results suggest that nickelates share tunable band-parameter sensitivities with cuprates, pointing to possible common mechanisms for unconventional pairing.
  • Systematic extension of the doping series could map an entire pressure-doping phase diagram and identify regions of enhanced transition temperature.
  • Spectroscopic probes on the same samples would help confirm whether the transport anomalies truly reflect density-wave order.

Load-bearing premise

The pressure-induced shifts of the superconducting phase and the observed anomalies arise specifically from the controlled changes in band width and filling rather than from impurities, oxygen vacancies, or other uncontrolled sample variations.

What would settle it

A measurement on samples with independently varied octahedra tilting but no corresponding shift in the pressure required for superconductivity would falsify the claim that band-width control drives the observed trend.

Figures

Figures reproduced from arXiv: 2604.13875 by A. Kikkawa, C. Terakura, H. Murayama, M. Kriener, M. Nakajima, N. Shibata, R. Ishikawa, S. Sasano, Y. Fujishiro, Y. Taguchi, Y. Tokura, Z. Liu.

Figure 1
Figure 1. Figure 1: FIG. 1 [PITH_FULL_IMAGE:figures/full_fig_p017_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2 [PITH_FULL_IMAGE:figures/full_fig_p018_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3 [PITH_FULL_IMAGE:figures/full_fig_p019_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: FIG. 4 [PITH_FULL_IMAGE:figures/full_fig_p020_4.png] view at source ↗
read the original abstract

The new family of superconducting nickelates centered around La$_{3}$Ni$_{2}$O$_{7}$ possesses attractive features, such as the high transition temperature and the presence of an antiferromagnetic ground state at ambient pressure, suggesting an unconventional pairing mechanism. In the nonsuperconducting state, the possibility of different density-wave orders with opposite pressure dependencies is discussed, whose relationships and microscopic origins are largely unknown. However, sample-quality issues, such as impurity-phase formation or oxygen vacancies, impede the progress in the field. Here, we employ high-pressure synthesis and hydrostatic high-pressure transport techniques to investigate bilayer nickelates with controlled band width and filling, and perform a systematic study on their impact on the superconductivity and other characteristic properties. While increasing the tilting of the NiO$_6$ octahedra shifts the superconducting phase to higher pressure, simultaneous hole doping reverts this trend. We also observe up to three distinct anomalies in the nonsuperconducting state which are possibly related to density-wave formation.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

3 major / 2 minor

Summary. The manuscript presents a systematic experimental study of bilayer nickelate superconductors (centered on La3Ni2O7) using high-pressure synthesis combined with hydrostatic high-pressure transport measurements. The central claim is that controlled increases in NiO6 octahedra tilting (band width) shift the superconducting phase to higher pressures, while simultaneous hole doping reverses this trend; additionally, up to three distinct anomalies are observed in the nonsuperconducting state and are suggested to possibly arise from density-wave formation. The work emphasizes overcoming sample-quality issues such as impurities and oxygen vacancies through high-pressure methods.

Significance. If the controls over band width and filling are rigorously verified and the trends are not confounded by sample variations, this study would provide a valuable handle on tuning parameters in the nickelate family, which features high Tc and an antiferromagnetic ground state at ambient pressure. The systematic approach and use of high-pressure synthesis represent a strength for addressing field-wide impediments to progress. It could help clarify relationships between superconductivity, possible density waves, and microscopic origins in these materials.

major comments (3)
  1. [Experimental Methods / Sample Characterization] The central attribution of pressure-induced shifts in the superconducting phase and the observed anomalies to controlled changes in band width (via octahedra tilting) and band filling (via hole doping) is load-bearing, yet the manuscript provides no quantitative sample characterization data (e.g., oxygen stoichiometry via iodometric titration or TGA, impurity phase fractions from Rietveld refinement of XRD, or local Ni valence from XPS/EDX) across the series of samples. Without these metrics shown to be uniform, residual variations could produce the same trends, as flagged in the abstract itself.
  2. [Results / Transport Measurements] The transport data underlying the claims of shifted superconducting domes and up to three distinct anomalies lack raw resistivity curves, error bars, multiple-sample reproducibility, or quantitative fits (e.g., to determine Tc onset/midpoint or anomaly temperatures). This absence makes it impossible to assess the statistical significance of the reported pressure dependencies or to distinguish density-wave signatures from other possible origins such as structural transitions or inhomogeneities.
  3. [Discussion / Nonsuperconducting State] The suggestion that the anomalies are 'possibly related to density-wave formation' is presented without supporting measurements (e.g., magnetic-field suppression, thermodynamic probes like specific heat, or comparison to theoretical predictions for CDW/SDW instabilities). Transport anomalies alone are insufficient to establish this interpretation as a load-bearing part of the narrative.
minor comments (2)
  1. [Introduction / Methods] Notation for the nickelate compositions (e.g., how hole doping levels are quantified and how tilting angles are extracted from structural data) should be defined more explicitly in the main text or a table for clarity.
  2. [Figures] Figure captions for the pressure-dependent transport data should include all relevant parameters (pressure calibration method, sample dimensions, current densities) to allow independent assessment of the results.

Simulated Author's Rebuttal

3 responses · 0 unresolved

We thank the referee for their detailed and constructive feedback on our manuscript. We have addressed the concerns regarding sample characterization, the presentation of transport data, and the interpretation of the nonsuperconducting anomalies. Our point-by-point responses are provided below, and we will incorporate appropriate revisions to strengthen the paper.

read point-by-point responses

  1. Referee: [Experimental Methods / Sample Characterization] The central attribution of pressure-induced shifts in the superconducting phase and the observed anomalies to controlled changes in band width (via octahedra tilting) and band filling (via hole doping) is load-bearing, yet the manuscript provides no quantitative sample characterization data (e.g., oxygen stoichiometry via iodometric titration or TGA, impurity phase fractions from Rietveld refinement of XRD, or local Ni valence from XPS/EDX) across the series of samples. Without these metrics shown to be uniform, residual variations could produce the same trends, as flagged in the abstract itself.

    Authors: We agree that providing quantitative characterization data would strengthen the claims by ruling out confounding factors from sample variations. Although the high-pressure synthesis was designed to produce high-quality samples with minimal impurities and oxygen vacancies, as stated in the manuscript, we did not include detailed metrics such as Rietveld refinements or titration results in the original submission. In the revised manuscript, we will add these data, including impurity phase fractions from XRD and oxygen content estimates, to demonstrate uniformity across the sample series. This will support that the observed trends are due to the controlled band width and filling rather than variations in quality. revision: yes

  2. Referee: [Results / Transport Measurements] The transport data underlying the claims of shifted superconducting domes and up to three distinct anomalies lack raw resistivity curves, error bars, multiple-sample reproducibility, or quantitative fits (e.g., to determine Tc onset/midpoint or anomaly temperatures). This absence makes it impossible to assess the statistical significance of the reported pressure dependencies or to distinguish density-wave signatures from other possible origins such as structural transitions or inhomogeneities.

    Authors: We acknowledge that the presentation of the transport data can be improved for better assessment of the results. The manuscript includes figures showing the pressure dependence, but to address this, we will include the raw resistivity vs. temperature curves in the supplementary material, report error bars from repeated measurements, confirm reproducibility across multiple samples, and provide quantitative criteria for extracting Tc and anomaly temperatures (e.g., onset defined as 10% drop or midpoint). This will allow readers to evaluate the significance of the shifts and the nature of the anomalies. revision: yes

  3. Referee: [Discussion / Nonsuperconducting State] The suggestion that the anomalies are 'possibly related to density-wave formation' is presented without supporting measurements (e.g., magnetic-field suppression, thermodynamic probes like specific heat, or comparison to theoretical predictions for CDW/SDW instabilities). Transport anomalies alone are insufficient to establish this interpretation as a load-bearing part of the narrative.

    Authors: We appreciate this point and agree that the interpretation is tentative. The manuscript uses 'possibly related' to indicate it is a hypothesis based on the multiple anomalies showing distinct pressure dependencies that could correspond to competing density waves, consistent with the antiferromagnetic ground state and theoretical models for nickelates. However, we do not claim definitive proof from transport alone. In the revision, we will clarify this by expanding the discussion to note alternative explanations (e.g., structural or magnetic transitions) and highlight the need for additional probes like specific heat or neutron scattering in future work. We will also include comparisons to existing theoretical predictions where relevant. revision: partial

Circularity Check

0 steps flagged

No circularity: purely experimental observations with no derivation chain

full rationale

The manuscript reports high-pressure synthesis and hydrostatic transport measurements on bilayer nickelates, controlling NiO6 octahedral tilting (band width) and hole doping (band filling) while tracking shifts in the superconducting dome and up to three nonsuperconducting anomalies. No equations, first-principles derivations, fitted parameters, or predictions appear in the provided text or abstract. Claims rest on direct experimental trends rather than any self-referential loop, self-citation chain, or renaming of known results. The work is self-contained as an observational study and does not invoke uniqueness theorems or ansatzes that reduce to prior author work.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

This is an experimental materials-physics study. The central claims rest on the assumption that high-pressure synthesis successfully controls band parameters and that transport anomalies reflect intrinsic electronic orders. No new mathematical axioms, free parameters, or postulated entities are introduced in the abstract.

axioms (1)
  • domain assumption Standard assumptions of band theory in transition-metal oxides relating octahedra geometry to bandwidth and doping level to band filling
    Implicit when the authors attribute observed shifts to controlled band width and filling.

pith-pipeline@v0.9.0 · 5521 in / 1389 out tokens · 44182 ms · 2026-05-10T12:15:49.915053+00:00 · methodology

discussion (0)

Sign in with ORCID, Apple, or X to comment. Anyone can read and Pith papers without signing in.

Forward citations

Cited by 1 Pith paper

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Superconductivity in bilayer La$_3$Ni$_2$O$_7$: A review focusing on the strong-coupling Hund's rule assisted pairing mechanism

    cond-mat.supr-con 2026-04 unverdicted novelty 3.0

    Superconductivity in La3Ni2O7 arises from interlayer Cooper pairs of 3d_x2-y2 electrons driven by effective J_perp from Hund-assisted AFM exchange transfer, while localized 3d_z2 electrons form rung singlets that prod...

Reference graph

Works this paper leans on

52 extracted references · 52 canonical work pages · cited by 1 Pith paper

  1. [1]

    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 (London)621, 493 (2023)

    work page 2023

  2. [2]

    Hou, P.-T

    J. Hou, P.-T. Yang, Z.-Y. Liu, J.-Y. Li, P.-F. Shan, L. Ma, G. Wang, N.-N. Wang, H.-Z. Guo, J.-P. Sun, Y. Uwatoko, M. Wang, G.-M. Zhang, B.-S. Wang, and J.-G. Cheng, Emergence of High-Temperature Superconducting Phase in Pressurized La 3Ni2O7 Crystals, Chem. Phys. Lett.40, 117302 (2023)

    work page 2023

  3. [3]

    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 La3Ni2O7−δ, Phys. Rev. X14, 011040 (2024)

    work page 2024

  4. [5]

    J. Li, D. Peng, P. Ma, H. Zhang, Z. Xing, X. Huang, C. Huang, M. Huo, D. Hu, Z. Dong, X. Chen, T. Xie, H. Dong, H. Sun, Q. Zeng, H. k. Mao, and M.Wang, Identification of superconductivity in bilayer nickelate La3Ni2O7 under high pressure up to 100 GPa, Nat. Sci. 11 Rev.12, nwaf220 (2025)

    work page 2025

  5. [6]

    L. Liu, J. Guo, D. Hu, G. Yan, Y. Chen, L. Yu, M. Wang, X.-D. Liu, and X. Huang, Evidence for the Meissner Effect in the Nickelate Superconductor La 3Ni2O7−δ Single Crystal Using Diamond Quantum Sensors, Phys. Rev. Lett.135, 096001 (2025)

    work page 2025

  6. [7]

    Imada, A

    M. Imada, A. Fujimori, and Y. Tokura, Metal-insulator transitions, Rev. Mod. Phys.70, 1039 (1998)

    work page 1998

  7. [8]

    Wang, H.-H

    M. Wang, H.-H. Wen, T. Wu, D.-X. Yao, and T. Xiang, Normal and Superconducting Prop- erties of La 3Ni2O7, Chem. Phys. Lett.41, 077402 (2024)

    work page 2024

  8. [9]

    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. Mao, and H. Liu, Structure Responsible for the Superconducting State in La 3Ni2O7 at High-Pressure and Low- Temperature Conditions, Inorg. Chem.146, 7506 (2024)

    work page 2024

  9. [10]

    Sakakibara, N

    H. Sakakibara, N. Kitamine, M. Ochi, and K. Kuroki, Possible HighT c Superconductivity in La3Ni2O7 under High Pressure through Manifestation of a Nearly Half-Filled Bilayer Hubbard Model, Phys. Rev. Lett.132, 106002 (2024)

    work page 2024

  10. [11]

    G. Wu, J. J. Neumeier, and M. F. Hundley, Magnetic susceptibility, heat capacity, and pressure dependence of the electrical resistivity of La 3Ni2O7 and La4Ni3O10, Phys. Rev. B63, 245120 (2001)

    work page 2001

  11. [12]

    Z. Liu, H. Sun, M. Huo, X. Ma, Y. Ji, E. Yi, L. Li, H. Liu, J. Yu, Z. Zhang, Z. Chen, F. Liang, H. Dong, H. Guo, D. Zhong, B. Shen, S. Li, and M. Wang, Evidence for charge and spin density waves in single crystals of La 3Ni2O7 and La 3Ni2O6, Sci. Chin. Phys., Mech. Astron. 66, 217411 (2023)

    work page 2023

  12. [13]

    Kakoi, T

    M. Kakoi, T. Oi, Y. Ohshita, M. Yashima, K. Kuroki, T. Kato, H. Takahashi, S. Ishiwata, Y. Adachi, N. Hatada, T. Uda, and H. Mukuda, Multiband Metallic Ground State in Multi- layered Nickelates La3Ni2O7 and La 4Ni3O10 Probed by 139La-NMR at Ambient Pressure, J. Phys. Soc. Jpn.93, 053702 (2024)

    work page 2024

  13. [14]

    K. Chen, X. Liu, J. Jiao, M. Zou, C. Jiang, X. Li, Y. Luo, Q. Wu, N. Zhang, Y. Guo, and L. Shu, Evidence of Spin Density Waves in La3Ni2O7−δ, Phys. Rev. Lett.132, 256503 (2024)

    work page 2024

  14. [15]

    X.-W. Yi, Y. Meng, J.-W. Li, Z.-W. Liao, W. Li, J.-Y. You, B. Gu, and G. Su, Nature of charge density waves and metal-insulator transition in pressurized La 3Ni2O7, Phys. Rev. B 110, L140508 (2024). 12

    work page 2024

  15. [16]

    Y. Meng, Y. Yang, H. Sun, S. Zhang, L. Chen, X. Ma, M. Wang, F. Hong, X. Wang, and X. Yu, Density-wave-like gap evolution in La3Ni2O7 under high pressure revealed by ultrafast optical spectroscopy, Nat. Commun.15, 10408 (2024)

    work page 2024

  16. [17]

    D. Zhao, Y. Zhou, M. Huo, Y. Wang, L. Nie, Y. Yang, J. Ying, M. Wang, T. Wu, and X. Chen, Pressure-enhanced spin-density-wave transition in double-layer nickelate La 3Ni2O7−δ, Sci. Bull.70, 1239 (2025)

    work page 2025

  17. [18]

    N. K. Gupta, R. Gong, Y. Wu, M. Kang, C. T. Parzyck, B. Z. Gregory, N. Costa, R. Sutarto, S. Sarker, A. Singer, D. G. Schlom, K. M. Shen, and D. G. Hawthorn, Anisotropic spin stripe domains in bilayer La 3Ni2O7, Nat. Commun.16, 6560 (2025)

    work page 2025

  18. [19]

    Yashima, N

    M. Yashima, N. Seto, Y. Oshita, M. Kakoi, H. Sakurai, Y. Takano, and H. Mukuda, Micro- scopic Evidence for Spin-Spinless Stripe Order with Reduced Ni Moments withinabPlane for Bilayer Nickelate La3Ni2O7 Probed by 139La-NQR, J. Phys. Soc. Jpn.94, 054704 (2025)

    work page 2025

  19. [20]

    Khasanov, T

    R. Khasanov, T. J. Hicken, D. J. Gawryluk, V. Sazgari, I. Plokhikh, L. P. Sorel, M. Bartkowiak, S. B¨ otzel, F. Lechermann, I. M. Eremin, H. Luetkens, and Z. Guguchia, Pressure-enhanced splitting of density wave transitions in La 3Ni2O7−δ, Nat. Phys.21, 430 (2025)

    work page 2025

  20. [21]

    Taniguchi, T

    S. Taniguchi, T. Nishikawa, Y. Yasui, Y. Kobayashi, J. Takeda, S. Shamoto, and M. Sato, Transport, Magnetic and Thermal Properties of La 3Ni2O7−δ, J. Phys. Soc. Jpn.64, 1644 (1995)

    work page 1995

  21. [22]

    Liu, J.-W

    Y.-B. Liu, J.-W. Mei, F. Ye, W.-Q. Chen, and F. Yang,s ±-Wave Pairing and the Destructive Role of Apical-Oxygen Deficiencies in La3Ni2O7 under Pressure, Phys. Rev. Lett.131, 236002 (2023)

    work page 2023

  22. [23]

    C. Lu, Z. Pan, F. Yang, and C. Wu, Interlayer-Coupling-Driven High-Temperature Supercon- ductivity in La 3Ni2O7 under Pressure, Phys. Rev. Lett.132, 146002 (2024)

    work page 2024

  23. [24]

    Nomura, M

    Y. Nomura, M. Kitatani, S. Sakai, and R. Arita, Strong-coupling high-T c superconductivity in doped correlated band insulators, Phys. Rev. B112, L020504 (2025)

    work page 2025

  24. [25]

    Y. Gu, C. Le, Z. Yang, X. Wu, and J.Hu, Effective model and pairing tendency in the bilayer Ni-based superconductor La 3Ni2O7, Phys. Rev. B111, 174506 (2025)

    work page 2025

  25. [26]

    Zheng and W

    Y.-Y. Zheng and W. W´ u,s±-wave superconductivity in the bilayer two-orbital Hubbard model, Phys. Rev. B111, 035108 (2025)

    work page 2025

  26. [27]

    Z. Liao, L. Chen, G. Duan, Y. Wang, C. Liu, R. Yu, and Q. Si, Electron correlations and superconductivity in La 3Ni2O7 under pressure tuning, Phys. Rev. B108, 214522 (2023). 13

    work page 2023

  27. [28]

    Jiang, J

    R. Jiang, J. Hou, Z. Fan, Z.-J. Lang, and W. Ku, Pressure Driven Fractionalization of Ionic Spins Results in Cupratelike High-T c Superconductivity in La 3Ni2O7, Phys. Rev. Lett.132, 126503 (2024)

    work page 2024

  28. [29]

    Z. Luo, B. Lv, M. Wang, and W. W. . . D.-X. Yao, High-T c superconductivity in La 3Ni2O7 based on the bilayer two-orbitalt−Jmodel, npj Quantum Mater.9, 61 (2024)

    work page 2024

  29. [30]

    C. Xia, H. Liu, S. Zhou, and H. Chen, Sensitive dependence of pairing symmetry on Ni- eg crystal field splitting in the nickelate superconductor La 3Ni2O7, Nat. Commun.16, 1054 (2025)

    work page 2025

  30. [31]

    C.-Q. Chen, W. Qiu, Z. Luo, M. Wang, and D.-X. Yao, Electronic structures and supercon- ductivity in Nd-doped La 3Ni2O7, Sci. Chin. Phys., Mech. Astron.69, 247414 (2026)

    work page 2026

  31. [34]

    F. Li, Z. Xing, D. Peng, J. Dou, N. Guo, L. Ma, Y. Zhang, L. Wang, J. Luo, J. Yang, J. Zhang, T. Chang, Y.-S. Chen, W. Cai, J. Cheng, Y. Wang, Y. Liu, T. Luo, N. Hirao, T. Matsuoka, H. Kadobayashi, Z. Zeng, Q. Zheng, R. Zhou, Q. Zeng, X. Tao, and J. Zhang, Bulk superconductivity up to 96 K in pressurized nickelate single crystals, Nature (London) 649, 871 (2026)

    work page 2026

  32. [35]

    Z. Qiu, J. Chen, D. V. Semenok, Q. Zhong, D. Zhou, J. Li, P. Ma, X. Huang, M. Huo, T. Xie, X. Chen, H. k. Mao, V. Struzhkin, H. Sun, and M. Wang, Interlayer coupling enhanced superconductivity near 100 K in La 3−xNdxNi2O7, arxiv.org/abs/2510.12359 (2025)

    work page arXiv 2025

  33. [36]

    Y. Zhou, J. Guo, S. Cai, H. Sun, C. Li, J. Zhao, P. Wang, J. Han, X. Chen, Y. Chen, Q. Wu, Y. Ding, T. Xiang, H. Mao, and L. Sun, Investigations of key issues on the reproducibility of high-Tc superconductivity emerging from compressed La 3Ni2O7, Matter Radiat. Extremes 10, 027801 (2025). 14

    work page 2025

  34. [37]

    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-Pressure Superconductor La 3Ni2O7, Phys. Rev. Lett.133, 146002 (2024)

    work page 2024

  35. [39]

    See Supporting Information for complementing data

    work page

  36. [40]

    Zhang, M

    Z. Zhang, M. Greenblatt, and J. B. Goodenough, Synthesis, Structure, and Properties of the Layered Perovskite La3Ni2O7−δ, J. Solid State Chem.108, 402 (1994)

    work page 1994

  37. [41]

    Ishikawa, A

    R. Ishikawa, A. R. Lupini, S. D. Findlay, and S. J. Pennycook, Quantitative Annular Dark Field Electron Microscopy Using Single Electron Signals, Microscopy and Microanalysis20, 99 (2014)

    work page 2014

  38. [42]

    Kawahara, R

    K. Kawahara, R. Ishikawa, S. Sasano, N. Shibata, and Y. Ikuhara, Total third-degree variation for noise reduction in atomic-resolution STEM images, Microscopy74, 1 (2025)

    work page 2025

  39. [43]

    Hanai, R

    M. Hanai, R. Ishikawa, M. Kawamura, M. Ohnishi, N. Takenaka, and K. Nakamura, ARIM- mdx Data System: Towards a Nationwide Data Platform for Materials Science, 2024 IEEE International Conference on Big Data (BigData)2024, 2326 (2024)

    work page 2024

  40. [44]

    +uNB16vFHWrT9x6MeWTx/HfXAbk=

    O. Cyr-Choini` ere, R. Daou, F. Lalibert´ e, C. Collignon, S. Badoux, D. LeBoeuf, J. Chang, B. J. Ramshaw, D. A. Bonn, W. N. Hardy, R. Liang, J.-Q. Yan, J.-G. Cheng, J.-S. Zhou, J. B. Goodenough, S. Pyon, T. Takayama, H. Takagi, N. Doiron-Leyraud, and L. Taillefer, Pseudogap temperatureT ∗ of cuprate superconductors from the Nernst effect, Phys. Rev. B 97...

    work page 2018

  41. [45]

    C. D. Ling, D. N. Argyriou, G. Wu, and J. J. Neumeier, Neutron Diffraction Study of La3Ni2O7: Structural Relationships Amongn= 1, 2, and 3 Phases La n+1NinO3n+1, J. Solid State Chem.152, 517 (1999)

    work page 1999

  42. [46]

    Takeda, R

    Y. Takeda, R. Kanno, M. Sakano, O. Yamamoto, M. Takano, Y. Bando, H. Akinaga, K. Takita, and J. B. Goodenough, Crystal chemistry and physical properties of La 2−xSrxNiO4 (0≤x≤ 1.6), Mater. Res. Bull.25, 293 (1990)

    work page 1990

  43. [47]

    V. I. Voronin, I. F. Berger, V. A. Cherepanov, L. Y. Gavrilova, A. N. Petrov, A. I. Ancharov, B. P. Tolochko, and S. G. Nikitenko, Neutron diffraction, synchrotron radiation and EXAFS spectroscopy study of crystal structure peculiarities of the lanthanum nickelates La n+1NinOy (n= 1, 2, 3), Nuclear Instr. Meth. Phys. Res. A470, 202 (2001)

    work page 2001

  44. [48]

    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...

    work page 2024

  45. [49]

    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, J. Am. Chem. Soc.146, 3640 (2024)

    work page 2024

  46. [50]

    Z. Dong, M. Huo, J. Li, J. Li, P. Li5, H. Sun, L. Gu, Y. Lu, M. Wang, Y. Wang, and Z. Chen, Visualization of oxygen vacancies and self-doped ligand holes in La3Ni2O7−δ, Nature (London) 630, 847 (2024)

    work page 2024

  47. [51]

    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, Phys. Rev. Mater.8, 053401 (2024)

    work page 2024

  48. [52]

    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 3Ni2O7, Inorg. Chem.63, 5020 (2024)

    work page 2024

  49. [53]

    Puphal, P

    P. Puphal, P. Reiss, N. Enderlein, Y.-M. Wu, G. Khaliullin, V. Sundaramurthy, T. Priessnitz, S18 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-Pressure Superconductor La 3Ni2O7, Phys. Rev. Lett.133, 146002 (2024)

    work page 2024

  50. [54]

    Insulator-Metal-Insulator

    M. Xu, S. Huyan, H. Wang, S. L. Bud’ko, X. Chen, X. Ke, J. F. Mitchell, P. C. Canfield, J. Li, and W. Xie, Pressure-Dependent “Insulator-Metal-Insulator” Behavior in Sr-Doped La3Ni2O7, Adv. Energy Mater.2024, 2400078 (2024)

    work page 2024

  51. [55]

    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, Nat. Phys.20, 1269 (2024)

    work page 2024

  52. [56]

    Khasanov, T

    R. Khasanov, T. J. Hicken, D. J. Gawryluk, V. Sazgari, I. Plokhikh, L. P. Sorel, M. Bartkowiak, S. B¨ otzel, F. Lechermann, I. M. Eremin, H. Luetkens, and Z. Guguchia, Pressure-enhanced splitting of density wave transitions in La 3Ni2O7−δ, Nat. Phys.21, 430 (2025). S19

    work page 2025