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Temperature-induced superconductivity enhancement under large exchange fields

Xusheng Wang1,*, Lianyi He1, and Shuai-Hua Ji1,2

  • *Contact author: wang-xs23@mails.tsinghua.edu.cn
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Phys. Rev. Research 8, 043079 – Published 20 October, 2026

DOI: https://doi.org/10.1103/6q41-1cxp

Abstract

Through a comprehensive free energy analysis, we demonstrate that finite temperature can simultaneously weaken superconductivity and mitigate Zeeman-effect-induced depairing, leading to potential nonmonotonic temperature-dependent behaviors in superconductors subjected to large exchange fields. Remarkably, superconductivity can be counterintuitively enhanced by temperature when the Zeeman energy exceeds the superconducting order parameter, owing to the competition between thermal and magnetic effects. We propose that multiband effect offers one possible microscopic route for this temperature-induced enhancement and demonstrate it explicitly within a two-band superconducting model. A detailed parameter analysis identifies the conditions under which this phenomenon emerges, suggesting that temperature-enhanced superconductivity may be observable in materials such as MgB2 and FeSe through transport and tunneling measurements.

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Phys. Rev. Research 8, 043079– Published 20 October, 2026
  • Received 25 November 2025
  • Accepted 1 October 2026
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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