Spontaneous appearance of the spin-triplet Fulde-Ferrell-Larkin-Ovchinnikov phase in a two-band model : possible application to LaFeAsO_{1-x}F_{x}

Bibliographic description

punktacja MNiSW [2015 A]: 15

title:	Spontaneous appearance of the spin-triplet Fulde-Ferrell-Larkin-Ovchinnikov phase in a two-band model : possible application to LaFeAsO_{1-x}F_{x}
author:	Zegrodnik Michał, Spałek Józef
journal title:	Journal of Superconductivity and Novel Magnetism
volume:	28
issue:	3
date of publication :	2015
pages:	1155-1160
ISSN:	1557-1939
eISSN:	1557-1947
DOI:	10.1007/s10948-014-2800-0
language:	English
journal language:	English
abstract in English:	The possibility of a spontaneous spin-triplet paired phase of the Fulde-Ferrell-Larkin-Ovchinnikov type is studied. As it is shown in a system with the dominant interband pairing and two distinct Fermi surface sheets, the Fermi wave-vector mismatch can be compensated by a nonzero center-of-mass momentum of the Cooper pairs. This idea is examined with the use of a model which describes the two hole-like bands in the iron-based superconductor. It is shown that for the proper range of model parameters, the minima of the free energy appear which correspond to a nonzero Cooper pair momentum. Different superconducting gap symmetries are analyzed, and the corresponding phase diagrams are shown.
keywords in English:	unconventional superconductivity, FFLO phase, iron pnictides
affiliation:	Wydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut Fizyki im. Mariana Smoluchowskiego
type:	journal article
subtype:	academic paper

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