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REVIEW 4 major objections 6 minor 35 references

Unified Terahertz Framework for Magnetic and Lattice Responses Reveals an Elusive Ordering Transition in Gd$_2$Ru$_2$O$_7$

T0 review · 4 major / 6 minor · reviewed 2026-08-02 · deepseek-v4-flash

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Pith's one-line read A single terahertz spectrum of Gd2Ru2O7 exposes the internal magnetic field at the rare-earth site and reveals an ordering transition of the Gd sublattice that bulk thermodynamic probes miss.

desk verdict New THz data on Gd2Ru2O7, but the multipolar-orientation claim is undermined by treating a powder sample as a single crystal. read the letter →

arxiv 2607.14029 v1 pith:H3K7H34N submitted 2026-07-15 cond-mat.str-el cond-mat.mtrl-sci

Nicolas M. Kawahala , Rafael L. Sabainsk , Esteban Marulanda , Rafael S. Freitas , Felix G. G. Hernandez This is my paper · ORCID
classification cond-mat.str-elcond-mat.mtrl-sci
keywords terahertztime-domainspectroscopyGd2Ru2O7pyrochloreruthenateexchange-splitrare-earthlevelsinternalexchangefieldspin-phononcouplingmultipolarorderhiddenmagneticordering
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

The paper claims that a single magneto-terahertz spectrum of the pyrochlore Gd2Ru2O7 can simultaneously measure the internal exchange field acting on the Gd3+ rare-earth moments and detect a magnetic ordering transition of the Gd sublattice that bulk specific-heat and susceptibility measurements have missed. By tracking a low-frequency resonance attributed to exchange-split Gd3+ levels, the authors extract an internal field of about 5–6 T whose orientation (70–79°) matches the value predicted for a cluster-multipolar ground state. In parallel, an infrared-active optical phonon shows sharp anomalies in frequency, linewidth, and spectral weight at the established Ru-ordering temperature and at a lower temperature scale; the low-temperature anomaly is interpreted as a genuine Gd-ordering transition, revealed because the phonon is sensitive to spin correlations through spin–phonon coupling. The larger point is a route: terahertz spectroscopy can expose hidden ordering transitions in frustrated magnets where thermodynamic probes are blind.

What carries the argument

The central object is the exchange-split Gd3+ magnetic excitation, whose resonance frequency νm is proportional to the magnitude of the total effective field through the Zeeman-like relation Δ = gμBBeff/h with Beff² = Bext² + Bint² + 2BextBint cosθ. This quadratic (cosine) law is the load-bearing identity: it converts two measured splittings into two independent estimates of Bint and one estimate of θ, the angle between internal and applied fields. The second probe is the 1.4 THz optical phonon, treated as a Lorentz oscillator whose scattering time τp acts as a thermometer for spin-disorder scattering; sharp maxima in τp mark the abrupt suppression of spin fluctuations at the two ordering te

What would settle it

A zero-field neutron-diffraction or 155Gd Mössbauer study that resolves the Gd sublattice below 10 K and shows no onset of long-range order, or no change in the Gd local environment at the temperature of the sharp phonon anomaly, would falsify the claim that the anomaly is a genuine ordering transition. Alternatively, measuring the low-frequency mode on a single crystal with the field along a known crystallographic axis and finding that the splitting does not follow ν² = νext² + νint² + 2νextνint cosθ with g≈2 would refute the exchange-split-level assignment.

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Extended reading notes

Core claim

At low temperature and zero field, Gd2Ru2O7 displays a weak resonance near 0.15 THz that hardens and gains weight under an applied field. The paper identifies this mode as a transition between exchange-split levels of the Gd3+ J=7/2 multiplet, split by an internal molecular field from the antiferromagnetically ordered Ru sublattice. Calibrating the splitting against the 7 T response above the Ru Néel temperature gives g≈2 and an internal field Bint≈5.4 T; combining the zero-field and 7 T splittings through the law Δ² = Δext² + Δint² + 2ΔextΔint cosθ yields an orientation θ≈70–79°, consistent with the θGd≈80° predicted for a cluster-multipolar Gd ground state. Independently, the 1.4 THz optic

Load-bearing premise

The entire extraction rests on the assumption that the low-frequency mode is a simple two-level transition between exchange-split Gd3+ states of a single J=7/2 multiplet with a fixed g-factor and a field- and temperature-independent internal field Bint; if the mode is a different excitation, or Bint changes with field or temperature, the quoted Bint and θ values, and the conclusion that the phonon anomaly marks a Gd ordering transition, would not follow.

Editorial extensions

If this is right

  • If the identification holds, THz conductivity becomes a quantitative probe of the internal exchange field at rare-earth sites, giving Bint and its orientation from one measurement.
  • The sharp phonon anomaly provides a thermodynamic-independent marker of rare-earth ordering, applicable to other pyrochlores and frustrated magnets where Schottky anomalies mask transitions.
  • The θ≈70–79° result independently supports the first-principles prediction of a cluster-multipolar ground state for the Gd sublattice, a state that bulk thermodynamic probes do not clearly detect.
  • The field shifts of both anomalies (110→75 K for Ru order, 10→30 K for Gd order) map a field–temperature phase diagram of the two sublattices in a single sample.
  • Because both magnetic and lattice responses appear in the same spectrum, the framework ties spin–phonon coupling directly to the magnetic energy scales, enabling tests of magnetoelastic coupling models.

Reading between the lines

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

  • If the framework generalizes, the same two-channel observation could be used to search for hidden order in other R2Ru2O7 (e.g., Tb, Dy) where rare-earth transitions may likewise be concealed by Schottky backgrounds; the predicted signature is a sharp phonon-lifetime maximum at a temperature where no thermodynamic anomaly appears.
  • A testable extension is to measure the phonon anomaly's field dependence in finer steps and look for hysteresis or a kink in the anomaly position versus field; a first-order or continuous phase boundary would strengthen the 'genuine transition' interpretation beyond what the current data alone establish.
  • The single-crystal prediction of the model — that the extracted θ rotates with crystal orientation — could be checked directly, and would independently confirm both the multipolar ground state and the validity of the effective-field picture.
  • If Bint were found (by, say, high-field measurements beyond 7 T) to be field-dependent, the paper's extraction method would need revision; the clean g≈2 and θ≈80° consistency is the main evidence that it does not.
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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

4 major / 6 minor

Summary. The manuscript reports magneto-THz time-domain spectroscopy of a pressed powder pellet of Gd2Ru2O7. It identifies a low-frequency mode that appears below ~30 K, assigns it to a transition within the exchange-split J=7/2 Gd3+ multiplet, and uses its frequency under applied fields up to 7 T to extract an internal exchange field B_int ≈ 5–6 T and an angle θ ≈ 70–79° between the internal and external fields, which the authors compare with the first-principles prediction θ_Gd ≈ 80° for cluster-multipolar order. It additionally tracks a ~1.4 THz optical phonon whose frequency, linewidth, and oscillator strength show anomalies near the Ru Néel temperature (≈110 K) and near 10 K (0 T) / 30 K (7 T); the latter anomaly is interpreted as evidence for a genuine Gd-sublattice ordering transition that bulk thermodynamic probes miss. The paper claims that a single THz spectrum can simultaneously quantify the internal field at the rare-earth site and reveal hidden rare-earth order through spin-phonon coupling.

Significance. If the central claims held, the work would be significant: it would provide a spectroscopic route to internal exchange fields and hidden multipolar order in rare-earth pyrochlores, and it would connect magnetic excitations and phonons in a single measurement. The authors include useful internal consistency checks, notably the integrated spectral weight analysis in Fig. S3, which shows that the main spectral trends are not purely artifacts of the Lorentzian fitting. The g-factor extracted from the field-dependent fit (g = 1.86 ± 0.17) is also close to the expected Gd3+ value. However, the central quantitative claims — the orientation θ and the identification of a genuine Gd ordering transition — rest on assumptions that are not met for the measured sample and on an unproven mode assignment. The paper is therefore not yet a reliable basis for the advertised unified framework.

major comments (4)
  1. [Supplemental Material, Sample Synthesis; Figures 2(c) and 3(c); law-of-cosines formula] The sample is a pressed powder pellet, but the central analysis treats the measured resonance as arising from a single relative angle θ between B_ext and B_int. In a random powder, θ is distributed over crystallites with uniform cosθ, so the resonance frequency at fixed B_ext should be a broad inhomogeneous distribution spanning from |Δ_ext − Δ_int| to Δ_ext + Δ_int. With Δ_ext ≈ 0.202 THz and Δ_int ≈ 0.155 THz at 1.6 K and 7 T, this spans ≈ 0.05–0.36 THz, more than an order of magnitude wider than the fitted Lorentzian (τ_m ≈ 10–20 ps corresponds to FWHM ≈ 0.01–0.02 THz). The observation of a single narrow resonance is incompatible with random powder averaging. Consequently, the extracted θ ≈ 70–79° is not a well-defined crystallographic angle and cannot be compared with the predicted θ_Gd ≈ 80°. The zero-field B_int ≈ 5.4 T is less affected, but the field-dependent B_int = 6.3(5) T and
  2. [Results and Discussion, identification of the low-frequency mode; Figs. 2(a)–(d) and 3(a)–(d)] The assignment of the low-frequency mode to a transition between exchange-split Gd3+ levels is inferred from its low-temperature emergence and field-induced hardening, but no definitive evidence is given. The mode could in principle be an impurity excitation, a two-magnon process, a phonon, or a Ru-related spin-gap excitation; the authors do not provide polarization analysis, high-field saturation data, or a quantitative CEF/exchange model that predicts the mode's oscillator strength, temperature dependence, or selection rules. Since all extracted values of B_int and θ depend on this assignment, the mode identification is load-bearing and needs direct support.
  3. [Results and Discussion, phonon anomalies and Gd-ordering claim; Figs. 2(f)–(h)] The claim that the phonon anomalies near 10 K (0 T) and 30 K (7 T) identify a 'genuine ordering transition' rather than a gradual crossover is not supported quantitatively. The anomalies are identified by eye in Lorentzian fit parameters, with no error bars, no statistical comparison to a smooth crossover model, and no independent confirmation (e.g., specific heat, neutron diffraction, or Mössbauer). Spin-phonon coupling can produce smooth or broad anomalies across a crossover, and the absence of a corresponding feature in the magnetic mode is explained by the broad Schottky contribution rather than by a sharp transition. Without a quantitative criterion or a corroborating probe, the interpretation of the low-temperature phonon anomaly as an elusive ordering transition is overclaimed.
  4. [Figure 3(c) and the field-dependent fit] The field-dependent fit uses g, B_int, and θ as free parameters to describe a single resonance frequency curve. Even setting aside the powder-averaging problem, three free parameters for one smooth curve can accommodate a wide range of B_int–θ combinations, and the reported θ = 70(8)° has a large uncertainty that is not propagated into the later comparison with the ab initio value. The agreement claimed in the abstract and conclusions is therefore weaker than the presentation suggests.
minor comments (6)
  1. [Throughout] The term 'pellet' is used without emphasizing that the sample is polycrystalline; this is central to the analysis and should be stated prominently in the main text, not only in the Supplemental Material.
  2. [Figures 2 and 3] No error bars are shown for the fitted Lorentzian parameters. At minimum, representative uncertainties should be given, especially for the phonon parameters used to claim anomalies.
  3. [Main text, law-of-cosines formula] The equation Δ² = Δ_ext² + Δ_int² + 2Δ_extΔ_int cosθ is central but is not numbered or defined carefully; the physical meaning of Δ_ext, Δ_int, and θ should be stated explicitly.
  4. [Figure 2 caption] The vertical dashed lines are listed as marking 10, 30, 75, and 110 K, but the text refers to both 75 K and 110 K as Ru-related scales; the assignment of each line should be clarified.
  5. [References] Reference [32] contains '[URL will be inserted by publisher]'; this placeholder should be resolved before publication.
  6. [Data availability] The data are not publicly available; the central claims rely on fitting procedures, so making the raw conductivity spectra and fit parameters available would materially strengthen reproducibility.

Circularity Check

0 steps flagged · score 0.0 of 10

No circularity found: the internal-field extraction and θ comparison use independently measured splittings and an external first-principles reference.

full rationale

The central quantitative chain is not circular. The calibration Δ_ext/B = 0.029 THz/T is measured at 7 T and 200 K, a regime the paper argues is above T_N where B_int is absent; the zero-field splitting Δ_int = 0.155 THz is measured separately at 1.6 K; and the 7 T low-temperature splitting Δ = 0.280 THz is a third independent measurement. Solving Δ² = Δ_ext² + Δ_int² + 2Δ_extΔ_int cosθ for θ is an algebraic use of independently measured inputs, not a fit of θ to the target prediction. The resulting θ ≈ 78° is then compared with θ_Gd ≈ 80° from Ref. [12], an external first-principles calculation with no author overlap, so this is a genuine external benchmark rather than a self-citation loop. The field-dependent Lorentz fit uses g, B_int, and θ as free parameters, but the paper presents it as a consistency check, not as an independent prediction; fitted parameters are not renamed as predictions. The phonon-anomaly interpretation is correlational and interpretive, not a derivation that reduces to its own inputs. The powder-pellet issue is a serious validity concern for interpreting θ as a single crystallographic angle, but it is not circular: it challenges the model's applicability rather than showing that an output equals an input by construction. Accordingly, no circular step meets the required evidentiary standard.

Assumptions & free parameters 4 free parameters · 4 assumptions · 0 invented entities

The central quantitative claims rest on a small number of fitted/model parameters (g, Bint, θ) and on the physical assumption that the low-frequency mode is an exchange-split Gd3+ transition. No new physical entities are invented. The phonon-based ordering transition is an interpretation requiring an implicit assumption about what constitutes a transition.

free parameters (4)
  • g-factor of Gd3+ = 1.86(17)
    Fit to the field dependence of the magnetic-mode frequency via Δ=gμ_BB_eff/h; used to extract Bint and θ. Expected value for Gd3+ is ≈2.
  • B_int (internal exchange field) = 5.4–6.3 T
    Extracted from zero-field splitting at 1.6 K and from the field-dependent Zeeman fit. This is the central quantity being measured, but also a model parameter.
  • θ (angle between internal and external field) = 70–79°
    Computed from the law of cosines using measured splittings and obtained as a free fit parameter in the field-dependent analysis; compared with theoretical 80°.
  • Lorentz oscillator parameters per spectrum = Ω_m, ν_m, τ_m; Ω_p, ν_p, τ_p; background coefficients a0,a1,a2
    All parameters in Eq. (S1) were allowed to vary independently at each temperature and field. These fitted parameters define the anomalies that support the ordering-transition claim.
assumptions (4)
  • domain assumption The 0.15 THz mode is a transition between exchange-split Gd3+ levels, not an impurity or other excitation.
    The entire Bint and θ determination rests on this assignment, argued from field dependence and energy scale but not proven by e.g. element-specific spectroscopy.
  • domain assumption Bint is negligible above TN (e.g., at 200 K) and unchanged by the applied field below TN.
    Used to calibrate Δ/B at 200 K and to treat Bint as a constant in the law-of-cosines analysis. If Bint changes with field or temperature, the extracted θ is biased.
  • domain assumption The splitting of the Gd3+ multiplet is described by a single effective field vector sum with a scalar g-factor.
    The formula Δ²=Δ_ext²+Δ_int²+2Δ_extΔ_int cosθ assumes the resonance tracks the magnitude of a vector-summed field; higher crystal-field or multi-level effects are neglected.
  • ad hoc to paper Sharp anomalies in phonon parameters at 10 K (0 T) and 30 K (7 T) mark a genuine ordering transition rather than a crossover or fitting artifact.
    The claim of an elusive Gd-ordering transition is inferred from phonon anomalies without an independent order-parameter measurement; this is a load-bearing interpretation.

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Cite this review

Pith. "Pith review of Unified Terahertz Framework for Magnetic and Lattice Responses Reveals an Elusive Ordering Transition in Gd$_2$Ru$_2$O$_7$." pith.science (2026). https://pith.science/paper/H3K7H34N

@misc{pith2026260714029,
  author       = {Pith},
  title        = {Pith review of: Unified Terahertz Framework for Magnetic and Lattice Responses Reveals an Elusive Ordering Transition in Gd$_2$Ru$_2$O$_7$},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/H3K7H34N}},
  note         = {Machine review of arXiv:2607.14029}
}
abstract

Magnetic order in materials combining localized rare-earth moments with itinerant transition-metal sublattices generates internal fields whose lattice imprint is rarely accessed directly. In Gd pyrochlore ruthenate, we find that a single terahertz spectrum resolves an exchange-split Gd$^{3+}$ mode and an optical phonon. Their coupled evolution quantifies the internal field, oriented as predicted for cluster-multipolar order, and reveals a Gd-ordering transition elusive to bulk thermodynamic probes, establishing a unified framework for accessing magnetic and lattice responses in correlated quantum materials.

Figures

Figures reproduced from arXiv: 2607.14029 by the authors.

Figure 1
Figure 1. FIG. 1. (a) Gd [PITH_FULL_IMAGE:figures/full_fig_p002_1.png] view at source ↗
Figure 2
Figure 2. FIG. 2. (a) Low-frequency optical conductivity showing a resonance associated with exchange-split Gd levels, for representative [PITH_FULL_IMAGE:figures/full_fig_p003_2.png] view at source ↗
Figure 3
Figure 3. FIG. 3. (a) Low-frequency optical conductivity at 1.6 K (solid lines) and 120 K (shaded lines) for external magnetic fields from [PITH_FULL_IMAGE:figures/full_fig_p004_3.png] view at source ↗

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Works this paper leans on

35 extracted references · 2 canonical work pages

  1. [1]

    D. N. Basov, R. D. Averitt, D. van der Marel, M. Dres- sel, and K. Haule, Electrodynamics of correlated electron materials, Rev. Mod. Phys.83, 471 (2011)

    2011

  2. [2]

    Alexandradinata, N

    A. Alexandradinata, N. P. Armitage, A. Baydin, W. Bi, Y. Cao, H. J. Changlani, E. Chertkov, E. H. da Silva Neto, L. Delacretaz, I. E. Baggari, G. M. Fer- guson, W. J. Gannon, S. A. A. Ghorashi, B. H. Goodge, O. Goulko, G. Grissonnanche, A. Hallas, I. M. Hayes, Y. He, E. W. Huang, A. Kogar, D. Kumah, J. Y. Lee, A. Legros, F. Mahmood, Y. Maximenko, N. Pella...

    2025

  3. [3]

    J. E. Greedan, Geometrically frustrated magnetic mate- rials, J. Mater. Chem.11, 37 (2001)

    2001

  4. [4]

    J. S. Gardner, M. J. P. Gingras, and J. E. Greedan, Mag- netic pyrochlore oxides, Rev. Mod. Phys.82, 53 (2010)

    2010

  5. [5]

    C. R. Wiebe, J. S. Gardner, S.-J. Kim, G. M. Luke, A. S. Wills, B. D. Gaulin, J. E. Greedan, I. Swainson, Y. Qiu, and C. Y. Jones, Magnetic Ordering in the Spin-Ice Can- didateHo 2Ru2O7, Phys. Rev. Lett.93, 076403 (2004)

    2004

  6. [6]

    J. H. Lee, D. Wulferding, J. Kim, D. Song, S. R. Park, and C. Kim, Linear scaling relationship of Néel temper- ature and dominant magnons in pyrochlore ruthenates, Phys. Rev. B108, 054443 (2023)

    2023

  7. [7]

    Museur, J

    F. Museur, J. Robert, F. Morineau, N. Bujault, V. Si- monet, E. Pachoud, A. Hadj-Azzem, C. V. Colin, L. Mangin-Thro, P. Manuel, J. R. Stewart, P. C. W. Holdsworth, and E. Lhotel, Ferromagnetic fragmented state in the pyrochloreHo 2Ru2O7, Phys. Rev. B113, L060406 (2026)

    2026

  8. [8]

    P. L. Oliveira Silva, J. G. A. Ramon, V. Peçanha- Antonio, T. Guidi, J. S. Gardner, C. S. Fang, and R. S. Freitas, Excitation spectrum and low-temperature mag- netism in the disordered defect-fluoriteHo2Zr2O7, Phys. Rev. B113, 214423 (2026)

    2026

Show all 35 references
  1. [9]

    Taira, M

    N. Taira, M. Wakeshima, and Y. Hinatsu, Magnetic sus- ceptibility and specific heat studies on heavy rare earth ruthenate pyrochlores R2Ru2O7 (R = Gd–Yb), J. Mater. Chem.12, 1475 (2002)

    2002

  2. [10]

    Gurgul, M

    J. Gurgul, M. Rams, i. d. Z. Świątkowska, R. Kmieć, and K. Tomala, Bulk magnetic measurements and99Ru and 155GdMössbauerspectroscopiesofGd 2Ru2O7,Phys. Rev. B75, 064426 (2007)

    2007

  3. [11]

    Okamura, R

    T. Okamura, R. Okazaki, H. Taniguchi, Y. Yasui, and I. Terasaki, Magnetoelectric Coupling in the Pyrochlore Ruthenate Gd2Ru2O7, Journal of the Physical Society of Japan86, 084708 (2017)

    2017

  4. [12]

    Huebsch, Y

    M.-T. Huebsch, Y. Nomura, S. Sakai, and R. Arita, Magnetic structures and electronic properties of cubic- pyrochlore ruthenates from first principles, Journal of Physics: Condensed Matter34, 194003 (2022)

    2022

  5. [13]

    Sibille, N

    R. Sibille, N. Gauthier, E. Lhotel, V. Porée, V. Pom- jakushin, R. A. Ewings, T. G. Perring, J. Ollivier, A. Wildes, C. Ritter, T. C. Hansen, D. A. Keen, G. J. Nilsen, L. Keller, S. Petit, and T. Fennell, A quantum liquid of magnetic octupoles on the pyrochlore lattice, Nature...

    2020

  6. [14]

    Hayami and H

    S. Hayami and H. Kusunose, Unified Description of Elec- tronic Orderings and Cross Correlations by Complete Multipole Representation, Journal of the Physical Soci- ety of Japan93, 072001 (2024)

    2024

  7. [15]

    Porée, A

    V. Porée, A. Bhardwaj, E. Lhotel, S. Petit, N. Gauthier, H.Yan, V.Pomjakushin, J.Ollivier, J.A.Quilliam, A.H. Nevidomskyy, H. J. Changlani, and R. Sibille, Dipolar- 6 octupolar correlations and hierarchy of exchange interac- tions inCe 2Hf 2O7, Phys. Rev. B112, L180404 (2025)

    2025

  8. [16]

    A. S. Patri, M. Hosoi, S. Lee, and Y. B. Kim, Theory of magnetostriction for multipolar quantum spin ice in pyrochlore materials, Phys. Rev. Res.2, 033015 (2020)

    2020

  9. [17]

    Huang, P

    B. Huang, P. Hao, and Z. Sheng, Short-range spin order and spin-phonon coupling inNaCrO 2 revealed by tera- hertz spectra, Phys. Rev. B113, 094435 (2026)

    2026

  10. [18]

    A. B. Sushkov, O. Tchernyshyov, W. R. II, S. W. Cheong, and H. D.Drew, Probing Spin Correlations with Phonons in the Strongly Frustrated MagnetZnCr2O4, Phys. Rev. Lett.94, 137202 (2005)

    2005

  11. [19]

    M. T. Warren, G. Pokharel, A. D. Christianson, D. Man- drus, and R. Valdés Aguilar, Terahertz dielectric analysis and spin-phonon coupling in multiferroicGeV4S8, Phys. Rev. B96, 054432 (2017)

    2017

  12. [20]

    E. A. Mashkovich, K. A. Grishunin, R. M. Dubrovin, A. K. Zvezdin, R. V. Pisarev, and A. V. Kimel, Tera- hertz light–driven coupling of antiferromagnetic spins to lattice, Science374, 1608 (2021)

    2021

  13. [21]

    van Duijn, N

    J. van Duijn, N. Hur, J. W. Taylor, Y. Qiu, Q. Z. Huang, S.-W. Cheong, C. Broholm, and T. G. Per- ring, From cooperative paramagnetism to Néel order in Y2Ru2O7: Neutron scattering measurements, Phys. Rev. B77, 020405 (2008)

    2008

  14. [22]

    J. S. Lee, T. W. Noh, J. S. Bae, I.-S. Yang, T. Takeda, and R. Kanno, Strong spin-phonon coupling in the geo- metrically frustrated pyrochloreY2Ru2O7, Phys. Rev. B 69, 214428 (2004)

    2004

  15. [23]

    Baydin, F

    A. Baydin, F. G. G. Hernandez, M. Rodriguez-Vega, A. K. Okazaki, F. Tay, G. T. Noe, I. Katayama, J. Takeda, H. Nojiri, P. H. O. Rappl, E. Abramof, G. A. Fiete, and J. Kono, Magnetic control of soft chiral phonons in PbTe, Phys. Rev. Lett.128, 075901 (2022)

    2022

  16. [24]

    F. G. G. Hernandez, A. Baydin, S. Chaudhary, F. Tay, I. Katayama, J. Takeda, H. Nojiri, A. K. Okazaki, P. H. O. Rappl, E. Abramof, M. Rodriguez-Vega, G. A. Fiete, and J. Kono, Observation of interplay between phonon chirality and electronic band topology, Science Advances9, ea...

    2023

  17. [25]

    Marulanda, M

    E. Marulanda, M. Dutra, N. M. Kawahala, E. D. Ste- fanato, G. G. Vasques, J. Munevar, M. A. Avila, and F. G. G. Hernandez, Colossal Terahertz Magnetoresis- tance from Magnetic Polarons in EuZn 2P2, (2026), arXiv:2603.21423 [cond-mat.str-el]

    2026

  18. [26]

    M. Koch, D. M. Mittleman, J. Ornik, and E. Castro- Camus, Terahertz time-domain spectroscopy, Nature Re- views Methods Primers3, 1 (2023)

    2023

  19. [27]

    Baydin, T

    A. Baydin, T. Makihara, N. M. Peraca, and J. Kono, Time-domain terahertz spectroscopy in high magnetic fields, Front. Optoelectron.14, 110 (2021)

    2021

  20. [28]

    Castro-Camus, D

    E. Castro-Camus, D. Ferrusca, J. Carpenter, D. Hughes, N. Qureshi, R. O. Freitas, E. Strupiechonski, J. Oblitas, M.Alfaro-Gomez, A.M.Gomez-Sepulveda, F.G.G.Her- nandez, F. Sanjuan, and M. Ortiz-Martinez, Terahertz and mm-Wave Research in Latin America, Journal of In- frared, M...

    2026

  21. [29]

    Lloyd-Hughes and T.-I

    J. Lloyd-Hughes and T.-I. Jeon, A review of the terahertz conductivity of bulk and nano-materials, Journal of In- frared, Millimeter, and Terahertz Waves33, 871 (2012)

    2012

  22. [30]

    Hernandez, Windowing in terahertz time-domain spec- troscopy: resolving resonancesin thin-filmsamples, Jour- nal of Infrared, Millimeter, and Terahertz Waves46, 75 (2025)

    E.Marulanda, F.L.Costa, N.M.Kawahala,andF.G.G. Hernandez, Windowing in terahertz time-domain spec- troscopy: resolving resonancesin thin-filmsamples, Jour- nal of Infrared, Millimeter, and Terahertz Waves46, 75 (2025)

    2025

  23. [31]

    L. O. Dias, E. D. Stefanato, N. M. Kawahala, and F. G. G. Hernandez, Optimizing Aperture Geometry in THz-TDS for Accurate Spectroscopy of Quantum Mate- rials, Brazilian Journal of Physics56, 35 (2026)

    2026

  24. [32]

    See Supplemental Material at [URL will be inserted by publisher] for additional experimental and analysis de- tails

  25. [33]

    A. F. Kraidy, A. S. Yapi, M. El Marssi, A. Penton Madri- gal, and Y. Gagou, Structural Refinement and Opto- electrical Properties of Nd2Ru2O7 and Gd2Ru2O7 Py- rochlore Oxides for Photovoltaic Applications, Materials 17, 10.3390/ma17112571 (2024)

    2024 doi

  26. [34]

    10.17188/1262381 (2020)

    Data retrieved from the materials project for Gd2Ru2O7 (mp-505216) from database version v2026.04.13. 10.17188/1262381 (2020)

    2020 doi

  27. [35]

    Castro, J

    A. Castro, J. Rosas-Huerta, and R. Escamilla, Effect of Mo substitution on the structure and electrical properties of Gd2Ru2O7 pyrochlore, Physica B: Condensed Matter 619, 413227 (2021). 7 SUPPLEMENT AL MA TERIAL SAMPLE SYNTHESIS AND CHARACTERIZA TION The measurements reported...

    2021

Pith tools

Reviewed August 2, 2026 · model on record in the stance chip above.