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arxiv: 2605.06514 · v1 · submitted 2026-05-07 · ❄️ cond-mat.supr-con

Recognition: unknown

Pair-Breaking and Dimensionality in Spin-Orbit Coupled Superconductors

Reiley Dorrian , Mizuki Ohno , Elena Williams , Adrian Llanos , Joseph Falson
Authors on Pith no claims yet

Pith reviewed 2026-05-08 04:07 UTC · model grok-4.3

classification ❄️ cond-mat.supr-con
keywords LaBi2thin filmssuperconductivitypair-breakingspin-orbit couplingmagnetic fieldsdimensionalitydepairsing
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The pith

Thin LaBi2 films reveal spin exchange scattering as a key depairing channel through field-enhanced superconductivity in the thin limit.

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

The paper examines thickness-dependent superconductivity in ultra-thin LaBi2 films exposed to parallel magnetic fields. It applies the multi-mechanism Kharitonov-Feigel'man framework to separate contributions from spin exchange scattering, paramagnetic limiting, and orbital effects. By resolving the field-enhanced superconductivity that appears specifically in the thin limit, the work estimates the strength of spin exchange scattering. This matters because conventional analyses often overlook spin exchange, leading to incomplete pictures of how the critical temperature and Pauli limit arise. The result recasts interpretations of scattering times in two-dimensional superconductors.

Core claim

The response of ultra-thin LaBi2 to parallel magnetic fields shows that multiple depairing mechanisms must be considered together. Resolving field-enhanced superconductivity in the thin limit allows an estimate of spin exchange scattering in addition to paramagnetic and orbital effects. This offers insight into how the critical temperature as well as the Pauli limit are defined, and recasts how scattering times in two-dimensional superconductors can be interpreted.

What carries the argument

The multi-mechanism Kharitonov-Feigel'man framework, which models the combined suppression of superconductivity by paramagnetic, orbital, and spin exchange scattering channels in thin films under parallel fields.

If this is right

  • The Pauli limit in these thin films incorporates a measurable contribution from spin exchange scattering.
  • Critical temperature definitions in two-dimensional superconductors must include thickness-dependent scattering channels.
  • Scattering times extracted from transport or magnetic data require reinterpretation once multiple depairing mechanisms are resolved.
  • Dimensionality tunes the relative weight of spin exchange scattering against orbital and paramagnetic effects.

Where Pith is reading between the lines

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

  • The same separation of mechanisms could be tested in other spin-orbit-coupled thin-film superconductors to check consistency of the framework.
  • Device-scale predictions for superconducting films in applied fields would improve if spin exchange scattering is routinely included.
  • Systematic variation of film thickness beyond the current range could further constrain the thickness dependence assumed in the model.

Load-bearing premise

The multi-mechanism Kharitonov-Feigel'man framework accurately captures all relevant depairing channels in LaBi2 without additional material-specific corrections or unaccounted thickness-dependent effects.

What would settle it

A direct measurement of scattering rates in thin LaBi2 films that fails to match the values estimated from the field-enhanced superconductivity when spin exchange scattering is included in the framework.

Figures

Figures reproduced from arXiv: 2605.06514 by Adrian Llanos, Elena Williams, Joseph Falson, Mizuki Ohno, Reiley Dorrian.

Figure 1
Figure 1. Figure 1: FIG. 1. (a) X-ray diffraction of the (006) Bragg peak for several films across the thickness series view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2. (a) In-plane upper critical field versus temperature for several film thicknesses. The lines view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3. (a) Zero-field view at source ↗
Figure 4
Figure 4. Figure 4: FIG. 4. Characteristic scattering times relevant to pair-breaking as estimated by KLB, KF, and view at source ↗
read the original abstract

The response of ultra-thin superconducting materials under parallel magnetic fields is often leveraged to obtain insight into the nature of the condensate, including features attributable to unconventional forms of pairing. Despite there being multiple competing mechanisms responsible for suppressing superconductivity, it is common for these analyses to overlook certain depairing channels. Here we report an analysis of thickness dependent superconductivity in thin films of \ce{LaBi2} using the multi-mechanism Kharitonov-Feigel'man framework . By resolving field-enhanced superconductivity in the thin-limit, we obtain an estimate the role of spin exchange scattering, in addition to paramagnetic and orbital effects. Our analyses offer insight into how fundamental quantities such as the critical temperature as well as Pauli limit are defined, recasting the landscape for how scattering times in two-dimensional superconductors can be interpreted.

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

0 major / 2 minor

Summary. The manuscript analyzes thickness-dependent superconductivity in LaBi2 thin films under parallel magnetic fields. It applies the multi-mechanism Kharitonov-Feigel'man framework to separate spin-exchange scattering from paramagnetic and orbital depairing channels by examining field-enhanced superconductivity in the thin-film limit. The central claim is that this resolves an estimate for the spin-exchange scattering time and recasts how critical temperature and Pauli limits are defined in two-dimensional spin-orbit-coupled superconductors.

Significance. If the Kharitonov-Feigel'man framework applies without material-specific corrections or unaccounted thickness-dependent effects, the work offers a concrete route to isolate spin-exchange scattering in thin-limit data. This would strengthen interpretation of scattering times and pair-breaking mechanisms in 2D superconductors, particularly where multiple depairing channels compete. The approach is internally consistent with standard thin-film theory and addresses a frequent oversight in the literature.

minor comments (2)
  1. Abstract: the sentence 'we obtain an estimate the role of spin exchange scattering' is missing the preposition 'of' and should be rephrased for grammatical clarity.
  2. Abstract: the phrase 'recasting the landscape for how scattering times in two-dimensional superconductors can be interpreted' is vague; a more precise statement of the concrete interpretive change would improve readability.

Simulated Author's Rebuttal

0 responses · 0 unresolved

We thank the referee for the positive assessment of our manuscript and the recommendation for minor revision. The summary accurately captures our use of the Kharitonov-Feigel'man framework to analyze thickness-dependent superconductivity in LaBi2 thin films under parallel fields, including the separation of spin-exchange scattering from other depairing mechanisms.

Circularity Check

0 steps flagged

No significant circularity detected

full rationale

The paper applies the external Kharitonov-Feigel'man multi-mechanism framework to separate spin-exchange, paramagnetic, and orbital depairing channels in LaBi2 thin films by analyzing thickness-dependent field-enhanced superconductivity. No equations or steps reduce by construction to fitted inputs, self-definitions, or load-bearing self-citations; the framework is invoked as an independent standard model whose parameters are not shown to be redefined from the target estimates. The derivation remains self-contained against external benchmarks of thin-film pair-breaking theory.

Axiom & Free-Parameter Ledger

2 free parameters · 1 axioms · 0 invented entities

Abstract-only; ledger populated from stated elements in the summary. The framework itself supplies the multi-mechanism structure; material-specific scattering times and thickness scaling are fitted or assumed.

free parameters (2)
  • spin exchange scattering time
    Estimated from the thin-limit data to separate its contribution from orbital and paramagnetic channels.
  • thickness-dependent critical temperature scaling
    Used to model how Tc varies with film thickness in the analysis.
axioms (1)
  • domain assumption Kharitonov-Feigel'man multi-mechanism depairing model applies without additional corrections to LaBi2
    Invoked as the analysis framework for all thickness and field data.

pith-pipeline@v0.9.0 · 5444 in / 1218 out tokens · 53617 ms · 2026-05-08T04:07:31.391264+00:00 · methodology

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