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arXiv · 1305.3678

Fulde-Ferrell-Larkin-Ovchinnikov States in Two-Band Superconductors

Takeshi Mizushima·Masahiro Takahashi·Kazushige Machida
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Abstract

We examine the possible phase diagram in an $H$-$T$ plane for Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) states in a two-band Pauli-limiting superconductor. We here demonstrate that, as a result of the competition of two different modulation length scales, the FFLO phase is divided into two phases by the first-order transition: the $Q_1$- and $Q_2$-FFLO phases at the higher and lower fields. The $Q_2$-FFLO phase is further divided by successive first order transitions into an infinite family of FFLO subphases with rational modulation vectors, forming a {\it devil's staircase structure} for the field dependences of the modulation vector and paramagnetic moment. The critical magnetic field above which the FFLO is stabilized is lower than that in a single-band superconductor. However, the tricritical Lifshitz point $L$ at $T_{\rm L}$ is invariant under two-band parameter changes.

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Takeshi Mizushima, Masahiro Takahashi, Kazushige Machida. 2013-05-16. Fulde-Ferrell-Larkin-Ovchinnikov States in Two-Band Superconductors. https://doi.org/10.7566/jpsj.83.023703

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