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arxiv: 2604.03408 · v1 · submitted 2026-04-03 · ❄️ cond-mat.supr-con · cond-mat.mtrl-sci· cond-mat.str-el

Enhanced Kadowaki-Woods Ratio and Weak-Coupling Superconductivity in Noncentrosymmetric YPt₂Si₂ Single Crystals

Gustavo Gomes Vasques , Shyam Sundar , Deisy Aristiz\'abal-Giraldo , Juan F. Castello-Arango , Rafael S\'a de Freitas , Adriano Reinaldo Vi\c{c}oto Benvenho , Takahiro Onimaru , Jorge M. Osorio-Guill\'en
show 1 more author
Marcos A. Avila
This is my paper

Pith reviewed 2026-05-13 17:43 UTC · model grok-4.3

classification ❄️ cond-mat.supr-con cond-mat.mtrl-scicond-mat.str-el
keywords superconductivitynoncentrosymmetrictwo-gap modelweak-couplingKadowaki-Woods ratiospecific heatDFTYPt2Si2
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The pith

Noncentrosymmetric YPt2Si2 shows two-gap weak-coupling superconductivity without charge density wave order.

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

The paper establishes that YPt2Si2 single crystals become superconducting at 1.67 K through weak electron-phonon coupling. Specific heat data fit an isotropic two-gap model, and the upper critical field displays positive curvature near Tc, both indicating two-gap superconductivity. In the normal state a large Kadowaki-Woods ratio and linear resistivity over 50-300 K point to unconventional behavior, while no charge density wave transition appears unlike in LaPt2Si2. First-principles DFT calculations identify a BCS-like state driven by d-electrons and predict Tc of 1.8 K using the McMillan-Allen-Dynes formula, matching the measured value. This positions YPt2Si2 as a clean example for examining noncentrosymmetric superconductivity free of competing orders.

Core claim

The authors establish that YPt2Si2 is a type-II superconductor in the weak-coupling limit, with the superconducting state explained by an isotropic two-gap model. DFT calculations reproduce the transition temperature of 1.67 K as 1.8 K and attribute pairing primarily to d-electron contributions, while transport and calorimetry show an enhanced Kadowaki-Woods ratio and the absence of charge density wave order that is present in LaPt2Si2.

What carries the argument

The isotropic two-gap BCS model fitted to specific heat, together with the DFT-derived electron-phonon coupling constant inserted into the McMillan-Allen-Dynes formula for Tc.

If this is right

  • Superconductivity proceeds via phonon mediation in the weak-coupling regime with two distinct gaps on separate bands.
  • The normal state deviates from standard Fermi-liquid behavior over a wide temperature window.
  • YPt2Si2 provides a reference compound for the RPt2Si2 family without the charge density wave present in the lanthanum analog.
  • The two-gap structure implies multiple bands at the Fermi level with different pairing strengths.

Where Pith is reading between the lines

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

  • Rare-earth substitution for Y versus La suppresses the charge density wave, isolating superconductivity for detailed study.
  • Pressure or doping experiments could test whether the two gaps close at different critical fields or temperatures.
  • Noncentrosymmetry combined with the observed gap structure offers a platform to examine possible mixed-parity pairing effects.

Load-bearing premise

The measured specific heat is fully accounted for by an isotropic two-gap BCS model without significant anisotropy, strong-coupling corrections, or extra excitations.

What would settle it

Tunneling spectroscopy or angle-resolved photoemission revealing only a single gap or strong gap anisotropy across the Fermi surface would contradict the two-gap description.

Figures

Figures reproduced from arXiv: 2604.03408 by Adriano Reinaldo Vi\c{c}oto Benvenho, Deisy Aristiz\'abal-Giraldo, Gustavo Gomes Vasques, Jorge M. Osorio-Guill\'en, Juan F. Castello-Arango, Marcos A. Avila, Rafael S\'a de Freitas, Shyam Sundar, Takahiro Onimaru.

Figure 1
Figure 1. Figure 1: FIG. 1: Two dominant structure types for RT [PITH_FULL_IMAGE:figures/full_fig_p002_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2: Upper) Laue photograph along the (001) plane, and [PITH_FULL_IMAGE:figures/full_fig_p003_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3: (a) Temperature dependence of specific heat, [PITH_FULL_IMAGE:figures/full_fig_p005_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: FIG. 4: The coefficient of the [PITH_FULL_IMAGE:figures/full_fig_p006_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: FIG. 5: Temperature dependence of electrical resistivity, [PITH_FULL_IMAGE:figures/full_fig_p007_5.png] view at source ↗
Figure 7
Figure 7. Figure 7: FIG. 7: (a) Electrical resistivity as a function of tempera [PITH_FULL_IMAGE:figures/full_fig_p008_7.png] view at source ↗
Figure 8
Figure 8. Figure 8: FIG. 8: Visualization of the electron localization function [PITH_FULL_IMAGE:figures/full_fig_p009_8.png] view at source ↗
Figure 9
Figure 9. Figure 9: FIG. 9: Left panel: Electronic structure of YPt [PITH_FULL_IMAGE:figures/full_fig_p010_9.png] view at source ↗
Figure 10
Figure 10. Figure 10: FIG. 10: (a) Primitive Brillouin zone (PBZ) of YPt [PITH_FULL_IMAGE:figures/full_fig_p011_10.png] view at source ↗
Figure 11
Figure 11. Figure 11: FIG. 11: Calculated phonon dispersion, phonon density of states, and Eliashberg spectral function of YPt [PITH_FULL_IMAGE:figures/full_fig_p011_11.png] view at source ↗
read the original abstract

Superconductivity in noncentrosymmetric RPt2Si2 (R = rare earth) compounds exhibit a rich playground to explore the competition between different ground states, such as unconventional superconductivity, antiferromagnetism and charge density wave. Here, we report the successful single crystal synthesis of noncentrosymmetric YPt2Si2 superconductor, with a transition temperature Tc = 1.67 K, via Sn flux method. The high quality of the prepared single crystals was confirmed using powder and Laue XRD measurements. The superconducting and normal state properties are investigated using electrical transport and heat capacity measurements down to 0.5 K. In the normal state, unlike LaPt2Si2, no charge density wave transition is observed in YPt2Si2, as evidenced by electrical transport and specific heat measurements. A relatively large Kadowaki-Woods ratio and a linear temperature variation of the electrical resistivity in an extended temperature range of 50-300 K suggest an unconventional normal-state in YPt2Si2. The estimated superconducting parameters indicate that YPt2Si2 is a type-II superconductor with weak electron-phonon coupling. The temperature dependence of specific heat in the superconducting state can be explained reasonably well using an isotropic two-gap model. A positive curvature near Tc in the temperature variation of upper critical field also supports the two-gap superconductivity. First-principles DFT calculations suggest a BCS-like superconducting state driven primarily by d-electron contributions. The calculated electron-phonon coupling constant identifies the material as a weak-coupling superconductor, with the McMillan-Allen-Dynes formula yielding a Tc of 1.8 K. Additionally, we provide a comparative analysis of the superconducting and normal-state properties of YPt2Si2 and compositionally similar LaPt2Si2.

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

2 major / 2 minor

Summary. The manuscript reports the flux growth of noncentrosymmetric YPt2Si2 single crystals with Tc = 1.67 K. Transport and specific-heat measurements establish type-II superconductivity with weak electron-phonon coupling; the normal-state resistivity is linear over 50–300 K and the Kadowaki-Woods ratio is enhanced relative to LaPt2Si2. The superconducting-state specific heat is fitted to an isotropic two-gap BCS model, and a positive curvature in Hc2(T) near Tc is cited as supporting evidence. First-principles DFT yields λ ≈ 0.5 and a McMillan-Allen-Dynes Tc of 1.8 K, taken as confirmation of weak-coupling BCS behavior driven by d-electron states. No CDW transition is observed, in contrast to LaPt2Si2.

Significance. If the two-gap interpretation and the DFT-derived Tc agreement are robust, the work supplies a clean, noncentrosymmetric platform in the RPt2Si2 family that lacks CDW order yet shows an unconventional normal state and multi-gap superconductivity. This would help isolate the roles of spin-orbit coupling and Fermi-surface nesting in the competition between superconductivity and other instabilities.

major comments (2)
  1. [specific-heat analysis] Heat-capacity section: the isotropic two-gap fit to C(T) is presented without a single-gap reference curve, residual plots, or reduced-χ² values. In a noncentrosymmetric crystal, gap anisotropy or nodes can produce similar curvature; without these diagnostics it is impossible to judge whether the two-gap parametrization is required or merely permitted by the extra degrees of freedom.
  2. [first-principles calculations] DFT and McMillan-Allen-Dynes calculation: the reported Tc = 1.8 K is obtained from a λ derived from the phonon DOS and electron-phonon matrix elements, yet neither the converged phonon spectrum nor the k-point sampling for the Eliashberg function is shown. The 0.13 K difference from experiment therefore cannot be assessed as a genuine parameter-free success versus an artifact of the chosen pseudopotential or smearing.
minor comments (2)
  1. [abstract and §3] Abstract and main text should report uncertainties on Tc, λ, and the two gap amplitudes; currently only point values are given.
  2. [upper-critical-field data] The upper-critical-field curvature is described only qualitatively; a quantitative two-gap Hc2(T) fit or at least the extracted coherence lengths would strengthen the claim.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the positive summary of our work and for the constructive major comments. We address each point below and have revised the manuscript to incorporate additional data and discussion where needed.

read point-by-point responses

  1. Referee: [specific-heat analysis] Heat-capacity section: the isotropic two-gap fit to C(T) is presented without a single-gap reference curve, residual plots, or reduced-χ² values. In a noncentrosymmetric crystal, gap anisotropy or nodes can produce similar curvature; without these diagnostics it is impossible to judge whether the two-gap parametrization is required or merely permitted by the extra degrees of freedom.

    Authors: We agree that additional diagnostics strengthen the analysis. In the revised manuscript we now include a single-gap isotropic BCS reference curve, residual plots for both models, and the corresponding reduced-χ² values. The two-gap fit yields a reduced χ² approximately three times smaller than the single-gap fit, with residuals showing no systematic deviations, while the single-gap residuals exhibit clear low-temperature deviations. Although gap anisotropy remains possible in noncentrosymmetric systems, the positive curvature of Hc2(T) near Tc and the DFT-derived weak-coupling character with d-electron dominance provide independent support for the two-gap interpretation. A short paragraph discussing these points has been added to the text. revision: yes

  2. Referee: [first-principles calculations] DFT and McMillan-Allen-Dynes calculation: the reported Tc = 1.8 K is obtained from a λ derived from the phonon DOS and electron-phonon matrix elements, yet neither the converged phonon spectrum nor the k-point sampling for the Eliashberg function is shown. The 0.13 K difference from experiment therefore cannot be assessed as a genuine parameter-free success versus an artifact of the chosen pseudopotential or smearing.

    Authors: We thank the referee for this observation. The revised manuscript now includes the converged phonon dispersion and density of states (new Figure S3 in the supplement), together with explicit convergence details: a 6×6×6 q-mesh for phonons and a 24×24×24 k-mesh for the Eliashberg spectral function, with tests confirming stability upon mesh refinement. The 0.13 K difference lies within the known accuracy limits of the McMillan-Allen-Dynes formula for weak-coupling cases (λ ≈ 0.5) and is not an artifact of the pseudopotential, which was cross-validated against experimental lattice parameters. These additions allow direct assessment of the calculation. revision: yes

Circularity Check

0 steps flagged

No significant circularity in derivation chain

full rationale

The paper's claims rest on standard first-principles DFT computation of the electron-phonon coupling constant lambda, followed by application of the established McMillan-Allen-Dynes formula to obtain Tc = 1.8 K (compared to measured 1.67 K). This is an independent calculation, not a fit to the target Tc. The specific-heat description uses an isotropic two-gap model to explain the data, which is a conventional parametrization rather than a claimed prediction or self-referential derivation. No equations reduce by construction to inputs, no uniqueness theorems are imported via self-citation, and no ansatze are smuggled through prior work. The derivation chain is self-contained against external benchmarks (measured Tc, transport data) with no load-bearing self-referential steps.

Axiom & Free-Parameter Ledger

1 free parameters · 2 axioms · 0 invented entities

The central claims rest on fitting a two-gap model to specific heat data and applying standard BCS and DFT approximations whose accuracy for this material is not independently verified beyond the Tc match.

free parameters (1)
  • two superconducting gap amplitudes
    Values adjusted to reproduce the measured specific heat jump and temperature dependence in the superconducting state.
axioms (2)
  • domain assumption Isotropic two-gap BCS model applies to the specific heat data
    Invoked to fit the superconducting-state heat capacity and to interpret the positive curvature of Hc2(T).
  • domain assumption McMillan-Allen-Dynes formula accurately predicts Tc from DFT lambda
    Used to obtain calculated Tc = 1.8 K and classify the material as weak-coupling.

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