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Comptes Rendus Physique
Volume 15, n° 7
pages 630-639 (août 2014)
Doi : 10.1016/j.crhy.2014.07.004
Spin fluctuation and Fermi surface instability in ferromagnetic superconductors
Fluctuation de spins et instabilité de la surface de Fermi dans les supraconducteurs ferromagnétiques
 

Dai Aoki a, b, , Adrien Gourgout b, Alexandre Pourret b, Gaël Bastien b, Georg Knebel b, Jacques Flouquet b
a IMR, Tohoku University, Oarai, Ibaraki, 311-1313, Japan 
b SPSMS, UMR-E CEA/UJF-Grenoble 1, INAC, 38054 Grenoble, France 

Corresponding author.
Abstract

We review the ferromagnetic superconductivity observed in the uranium based compounds, namely UGe2 , URhGe and UCoGe, where the spin-triplet state is most likely realized. An unusual upper critical field  , which is enhanced under a magnetic field in a certain field direction, is discussed in terms of spin fluctuations and of Fermi surface instabilities.

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Résumé

Dans cet article, on présente une revue des supraconducteurs ferromagnétiques à base d'uranium, tels UGe2 , URhGe et UCoGe, dans lesquels l'état fondamental est un triplet de spin. Le champ critique supérieur   a un comportement non usuel dans ces composés et croît en présence d'un champ magnétique appliqué le long de certaines directions. Ce phénomène est discuté en termes de fluctuations de spin et d'instabilités de la surface de Fermi.

The full text of this article is available in PDF format.

Keywords : Heavy fermion, Unconventional superconductivity, Ferromagnetism, UGe2 , UCoGe, URhGe

Mots-clés : Fermions lourds, Supraconductivité non conventionnelle, Ferromagnetism, UGe2 , UCoGe, URhGe




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