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arXiv · 2512.23954

Reentrant Superconductivity from Competing Spin-Triplet Instabilities

Jun Goryo
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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.

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Jun Goryo. 2025-12-30. Reentrant Superconductivity from Competing Spin-Triplet Instabilities. https://doi.org/10.1088/1361-648x%2Fae7526

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