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PreprintarXiv licencearXiv

Momentum-resolved thermodynamics and barrier-free order-parameter collapse in spin-orbit-coupled superconductors under a Zeeman field

  • Xusheng Wang
  • Gaomin Tang
  • Lianyi He
  • Shuai-Hua Ji
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Abstract

Spin-orbit coupling (SOC) can enhance the critical Zeeman field of clean superconductors beyond the Pauli limit. We develop a momentum decomposition of the zero-temperature free energy to investigate spin-singlet s-wave superconductors with general time-reversal-symmetric SOC. The SOC component perpendicular to the Zeeman field enhances the critical field and suppresses first-order features, whereas the parallel component favors Pauli-limited thermodynamic behavior. Applying this framework to Rashba superconductors and Ising superconductors with weak Rashba SOC, we identify the origin of the abrupt collapse of the superconducting order parameter at the critical field. Competing angular contributions produce a nearly flat free-energy landscape, allowing a barrier-free order-parameter collapse distinct from the conventional Pauli-limited first-order transition.

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Cite

BibTeXRIS
BibTeX
@misc{wang2026momentumresolved,
  title = {{Momentum-resolved thermodynamics and barrier-free order-parameter collapse in spin-orbit-coupled superconductors under a Zeeman field}},
  author = {Xusheng Wang and Gaomin Tang and Lianyi He and Shuai-Hua Ji},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.35381},
  eprint = {2610.35381},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.35381},
}
RIS
TY  - UNPB
TI  - Momentum-resolved thermodynamics and barrier-free order-parameter collapse in spin-orbit-coupled superconductors under a Zeeman field
AU  - Xusheng Wang
AU  - Gaomin Tang
AU  - Lianyi He
AU  - Shuai-Hua Ji
PY  - 2026
DA  - 2026/10/26
PB  - arXiv
DO  - 10.48550/arxiv.2610.35381
UR  - https://arxiv.org/abs/2610.35381
AB  - Spin-orbit coupling (SOC) can enhance the critical Zeeman field of clean superconductors beyond the Pauli limit. We develop a momentum decomposition of the zero-temperature free energy to investigate spin-singlet s-wave superconductors with general time-reversal-symmetric SOC. The SOC component perpendicular to the Zeeman field enhances the critical field and suppresses first-order features, whereas the parallel component favors Pauli-limited thermodynamic behavior. Applying this framework to Rashba superconductors and Ising superconductors with weak Rashba SOC, we identify the origin of the abrupt collapse of the superconducting order parameter at the critical field. Competing angular contributions produce a nearly flat free-energy landscape, allowing a barrier-free order-parameter collapse distinct from the conventional Pauli-limited first-order transition.
ER  -