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Peer-reviewedCC BY 4.0Physical Review Research

Temperature-induced superconductivity enhancement under large exchange fields

  • Xusheng Wang1,2
  • Lianyi He1,2
  • Shuai-Hua Ji1,2,3
  1. 1State Key Laboratory of Low-Dimensional Quantum Physics
  2. 2Tsinghua University
  3. 3Frontier Science Center for Quantum Information
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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 MgB 2 and FeSe through transport and tunneling measurements.

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Cite

BibTeXRIS
BibTeX
@article{wang2026temperatureinduced,
  title = {{Temperature-induced superconductivity enhancement under large exchange fields}},
  author = {Xusheng Wang and Lianyi He and Shuai-Hua Ji},
  journal = {Physical Review Research},
  year = {2026},
  month = oct,
  doi = {10.1103/6q41-1cxp},
  url = {https://link.aps.org/doi/10.1103/6q41-1cxp},
  note = {CC BY 4.0},
}
RIS
TY  - JOUR
TI  - Temperature-induced superconductivity enhancement under large exchange fields
AU  - Xusheng Wang
AU  - Lianyi He
AU  - Shuai-Hua Ji
PY  - 2026
DA  - 2026/10/20
JO  - Physical Review Research
DO  - 10.1103/6q41-1cxp
UR  - https://link.aps.org/doi/10.1103/6q41-1cxp
AB  - 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 MgB 2 and FeSe through transport and tunneling measurements.
SN  - 2643-1564
ER  -