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arxiv: 2605.12381 · v1 · submitted 2026-05-12 · ❄️ cond-mat.supr-con

Recognition: no theorem link

Anomalous spin-pumping behavior of half-metallic ferromagnet/d-wave superconductor heterostructures

Alexander Buzdin, F. Martinet, Hadi H. Hassan, Jacobo Santamaria, Javier E. Villegas, M. Cabero, Santiago J. Carreira

Authors on Pith no claims yet

Pith reviewed 2026-05-13 02:36 UTC · model grok-4.3

classification ❄️ cond-mat.supr-con
keywords spin pumpingGilbert dampingd-wave superconductorAndreev statesproximity effecthalf-metallic ferromagnetYBCO/LSMOferromagnetic resonance
0
0 comments X

The pith

In c-axis YBCO/LSMO stacks Gilbert damping peaks below Tc from interface Andreev states caused by proximity suppression of the order parameter.

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

The paper measures the temperature-dependent Gilbert damping coefficient alpha via ferromagnetic resonance in epitaxial YBa2Cu3O7-d/La0.7Sr0.3MnO3 heterostructures for two orientations. In (103)-oriented samples the ab-plane is exposed at the interface and alpha decreases just below Tc before rising again at lower temperatures, consistent with spin transport through nodal quasiparticles once the d-wave gap opens. In c-axis oriented samples alpha instead rises sharply below Tc, reaches a maximum near 0.65-0.7 Tc, then decays, which the authors trace to interface-bound Andreev states that appear when the superconducting order parameter is locally suppressed by proximity to the half-metallic ferromagnet. The orientation contrast shows that d-wave gap symmetry and half-metallicity together decide whether nodal quasiparticles or bound states dominate spin sinking. Readers may care because the result identifies a concrete mechanism by which interface geometry controls spin relaxation across the superconducting transition.

Core claim

For c-axis heterostructures the pronounced enhancement of alpha(T) below Tc, peaking at 0.65-0.7 Tc before decaying, indicates the dominance of interface-bound Andreev states that arise from a locally suppressed superconducting order parameter due to proximity effects with the half-metallic LSMO. In contrast, (103) heterostructures show an initial drop in alpha below Tc followed by an increase, understood as spin transport via nodal quasiparticles when the ab-plane of YBCO is exposed at the interface.

What carries the argument

Interface-bound Andreev states formed by proximity-induced local suppression of the d-wave order parameter at the half-metal boundary, which provide an additional channel for spin relaxation.

If this is right

  • Nodal quasiparticles enable spin transport below Tc when the ab-plane faces the interface.
  • Proximity suppression of the order parameter creates bound states that enhance damping only in the c-axis geometry.
  • Ferromagnetic resonance linewidth becomes a direct probe of interface Andreev physics in these hybrids.
  • The dominant spin-sinking channel can be selected by choosing crystalline orientation during growth.

Where Pith is reading between the lines

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

  • Interface orientation could be used to design temperature-tunable spin sinks that activate around 0.7 Tc.
  • The same damping signature might appear in other half-metal/d-wave combinations, offering a general test for Andreev-state dominance.
  • If the mechanism holds, it supplies a new handle for controlling magnon decay rates across the superconducting transition in hybrid devices.

Load-bearing premise

The measured temperature changes in Gilbert damping are caused by the superconducting interface states rather than interface roughness, magnetic impurities, or artifacts in extracting the FMR linewidth.

What would settle it

If the damping peak below Tc disappears in otherwise identical c-axis samples grown with an s-wave superconductor or with a non-half-metallic ferromagnet, the claim that the anomaly requires the specific combination of d-wave gap and half-metal proximity would be falsified.

Figures

Figures reproduced from arXiv: 2605.12381 by Alexander Buzdin, F. Martinet, Hadi H. Hassan, Jacobo Santamaria, Javier E. Villegas, M. Cabero, Santiago J. Carreira.

Figure 5
Figure 5. Figure 5: (a) taken at different temperatures, to obtain 𝛼(T), 𝜇0𝛥𝐻0(T), 𝜇0𝐻𝑘 (𝑇) and 𝑀𝑒𝑓𝑓(T). An example of this analysis, accompanied by electrical transport characterization of superconductivity, is shown in [PITH_FULL_IMAGE:figures/full_fig_p015_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: Results obtained as a function of temperature T for a c-axis superconducting bilayer (S) (in red) and its non-superconducting reference (nS) (in black). (a) R vs T, (b) 𝜇0𝛥𝐻𝑝𝑝 vs T of the S sample for different frequencies, (c) damping 𝛼 vs T, (d) inhomogeneous broadening 𝜇0𝐻0 vs T, (e) anisotropy field 𝜇0𝐻𝑘 vs T and effective magnetization 𝑀𝑒𝑓𝑓 vs T [PITH_FULL_IMAGE:figures/full_fig_p017_6.png] view at source ↗
read the original abstract

Spin-pumping experiments in superconductor/ferromagnet heterostructures, which probe spin-sinking by the superconductor, have revealed a variety of complex behaviors. Most studies have focused on conventional s-wave superconductors combined with metallic or insulating ferromagnets. Here, we study a d-wave superconductor paired with a half-metallic ferromagnet, in epitaxial YBa2Cu3O7-d/La0.7Sr0.3MnO3 heterostructures with two crystalline orientations: one in which YBCO is c-axis oriented, and the other in which YBCO grows along the (103) direction. Using ferromagnetic resonance (FMR), we probe the temperature-dependent Gilbert damping coefficient {\alpha}. For (103) heterostructures, {\alpha}(T) initially decreases below Tc, but then increases at lower temperatures, exceeding normal-state levels. This behavior can be understood in terms of the opening of the superconducting gap and spin transport via nodal quasiparticles, which dominate when the ab-plane of YBCO is exposed at the interface. In stark contrast, c-axis heterostructures exhibit a pronounced enhancement of {\alpha}(T) below Tc, peaking at 0.65-0.7Tc before decaying. This anomaly suggests the dominance of interface-bound Andreev states, arising from a locally suppressed superconducting order parameter due to proximity effects with the half-metallic LSMO.

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 reports FMR measurements of the Gilbert damping α(T) in epitaxial YBCO/LSMO heterostructures. For (103)-oriented YBCO, α(T) decreases below Tc then rises at lower T, interpreted via nodal quasiparticles. For c-axis orientation, α(T) shows a pronounced peak below Tc at ~0.65–0.7 Tc before decaying, attributed to interface-bound Andreev states from proximity-suppressed superconducting order parameter at the half-metallic interface.

Significance. If the central interpretation is confirmed, the work identifies a distinct spin-sinking channel at d-wave/half-metal interfaces that is absent in conventional s-wave systems, with potential implications for spintronic devices exploiting Andreev bound states.

major comments (3)
  1. [Results (c-axis data) and Discussion] The attribution of the α(T) peak in c-axis samples to interface-bound Andreev states (abstract and discussion) is load-bearing on the assumption that measured linewidth changes reflect intrinsic spin pumping rather than interface disorder. No STEM/TEM roughness metrics, dead-layer magnetization data, or explicit checks for magnetic impurities are presented to exclude these confounders.
  2. [Experimental Methods (FMR linewidth extraction)] The FMR analysis section provides no quantitative protocol for separating intrinsic Gilbert damping from inhomogeneous broadening or temperature-dependent stray-field effects that can arise when the superconducting gap opens; this is required to substantiate that the non-monotonic α(T) is dominated by Andreev states.
  3. [Discussion] The claim that the peak occurs at 0.65–0.7 Tc due to locally suppressed order parameter lacks comparison to a microscopic model of Andreev-state density of states or proximity-effect calculations; without this, the temperature scale remains phenomenological.
minor comments (2)
  1. [Introduction] The introduction would benefit from explicit comparison to prior spin-pumping studies on d-wave systems (e.g., YBCO with non-half-metallic ferromagnets) to clarify the novelty of the half-metallic case.
  2. [Figure captions] Figure captions for α(T) plots should include error bars and the number of independent samples measured to allow assessment of reproducibility.

Simulated Author's Rebuttal

3 responses · 0 unresolved

We thank the referee for the detailed and constructive report. The comments highlight important points on experimental rigor and interpretation that we address below. We have revised the manuscript to incorporate additional details and clarifications where feasible.

read point-by-point responses

  1. Referee: [Results (c-axis data) and Discussion] The attribution of the α(T) peak in c-axis samples to interface-bound Andreev states (abstract and discussion) is load-bearing on the assumption that measured linewidth changes reflect intrinsic spin pumping rather than interface disorder. No STEM/TEM roughness metrics, dead-layer magnetization data, or explicit checks for magnetic impurities are presented to exclude these confounders.

    Authors: We agree that direct structural and magnetic characterization of the interface would further strengthen the interpretation. The manuscript does not include new STEM/TEM or dead-layer data, as these were not part of the original experimental campaign. However, the observed peak is orientation-specific (absent in (103) samples) and occurs at a well-defined reduced temperature, which is inconsistent with generic disorder or impurity broadening that would typically produce monotonic or sample-dependent effects. We have added a new paragraph in the Discussion section explicitly addressing potential interface disorder, magnetic dead layers, and impurities, citing why such effects are unlikely to produce the reported non-monotonic behavior. We also note that the FMR signal remains Lorentzian and the resonance field follows expected temperature dependence, providing indirect support for intrinsic spin pumping. revision: partial

  2. Referee: [Experimental Methods (FMR linewidth extraction)] The FMR analysis section provides no quantitative protocol for separating intrinsic Gilbert damping from inhomogeneous broadening or temperature-dependent stray-field effects that can arise when the superconducting gap opens; this is required to substantiate that the non-monotonic α(T) is dominated by Andreev states.

    Authors: We accept this criticism and have substantially expanded the Experimental Methods and Data Analysis sections. The revised text now includes a quantitative protocol: linewidths are extracted from Lorentzian fits to frequency-dependent FMR spectra (4–12 GHz) at each temperature; the Gilbert damping α is obtained from the slope of ΔH vs. frequency after subtracting a temperature-independent inhomogeneous term; and we explicitly discuss and correct for possible stray-field shifts below Tc by tracking the resonance field position and comparing to control samples. These steps confirm that the non-monotonic features survive after standard corrections. revision: yes

  3. Referee: [Discussion] The claim that the peak occurs at 0.65–0.7 Tc due to locally suppressed order parameter lacks comparison to a microscopic model of Andreev-state density of states or proximity-effect calculations; without this, the temperature scale remains phenomenological.

    Authors: We acknowledge that a full self-consistent microscopic calculation of the Andreev bound-state spectrum at the half-metal/d-wave interface is beyond the scope of the present experimental study. The temperature scale 0.65–0.7 Tc is presented as phenomenological, guided by the expected suppression of the order parameter near a half-metallic interface. In the revised Discussion we have added references to existing proximity-effect theories for d-wave/half-metal junctions and noted that the observed peak position is consistent with the temperature at which interface-bound states are predicted to contribute maximally to the spin density of states. We have softened the language from “arising from” to “suggests the dominance of” to reflect the current level of modeling. revision: partial

Circularity Check

0 steps flagged

No circularity: experimental α(T) data interpreted via standard d-wave concepts

full rationale

The paper reports FMR measurements of Gilbert damping α(T) in epitaxial YBCO/LSMO heterostructures for two orientations. The (103) behavior is attributed to gap opening plus nodal quasiparticles; the c-axis peak is attributed to interface Andreev states from proximity-suppressed order parameter. These are qualitative phenomenological readings that invoke textbook features of d-wave superconductivity and half-metallic ferromagnets. No equations, fitted parameters, or self-citations are shown that reduce any claimed result to the same dataset by construction. The derivation chain is therefore self-contained against external benchmarks.

Axiom & Free-Parameter Ledger

0 free parameters · 2 axioms · 0 invented entities

The central interpretations rest on standard FMR analysis formulas and domain assumptions about epitaxial interface quality and superconducting gap suppression; no new free parameters, ad-hoc axioms, or invented entities are introduced.

axioms (2)
  • standard math Gilbert damping coefficient is reliably extracted from FMR linewidth using established Lorentzian fitting and Kittel equation relations
    Invoked implicitly when reporting alpha(T) from resonance measurements.
  • domain assumption The two crystalline orientations produce distinct interface terminations (ab-plane exposed vs c-axis) with clean epitaxial growth
    Required to assign the observed behaviors to nodal quasiparticles versus Andreev states.

pith-pipeline@v0.9.0 · 5584 in / 1410 out tokens · 71689 ms · 2026-05-13T02:36:02.165967+00:00 · methodology

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Reference graph

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