Reentrant Superconductivity from Competing Spin-Triplet Instabilities
Superconductivity
2026-05-18 v3
Abstract
Reentrant superconductivity in strong magnetic fields challenges the conventional expectation that magnetic fields necessarily suppress superconductivity. We show that reentrant superconducting instability can arise from the competition between spin-unpolarized and spin-polarized superconducting channels. Using a minimal Ginzburg--Landau theory with two coupled spin-triplet order parameters, we demonstrate that a magnetic field can reorganize the hierarchy of superconducting instabilities, yielding a characteristic reentrant instability curve over a broad parameter range.
Cite
@article{arxiv.2512.23954,
title = {Reentrant Superconductivity from Competing Spin-Triplet Instabilities},
author = {Jun Goryo},
journal= {arXiv preprint arXiv:2512.23954},
year = {2026}
}