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Fulde-Ferrell-Larkin-Ovchinnikov States in Two-Band Superconductors | Takeshi Mizushima
; Masahiro Takahashi
; Kazushige Machida
; | Date: |
16 May 2013 | Abstract: | We examine 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 consequence of the competition of
two different modulation length scales, the FFLO phase is divided into two
phases via the first order transition: Q_1- and Q_2-FFLO phases at the higher
and lower fields. The Q_2-FFLO phase is further subdivided by successive first
order transitions into the infinite family of FFLO subphases with rational
modulation vectors, forming a devil’s staircase structure for the
field-dependence of the modulation vector and paramagnetic moment. The critical
magnetic field above which the FFLO is stabilized gets lower than that in a
single band superconductor, yet, tricritical Lifshitz point L at T_L is
invariant under two-band parameter changes. | Source: | arXiv, 1305.3678 | Services: | Forum | Review | PDF | Favorites |
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