Superconductivity Reinforced by Magnetic Field and the Magnetic Instability in Uranium Ferromagnets

被引：34

作者：

Aoki, Dai ^{[1
]}

Matsuda, Tatsuma D. ^{[1
,2
]}

Hardy, Frederic ^{[3
]}

Meingast, Christoph ^{[3
]}

Taufour, Valentin ^{[1
]}

Hassinger, Elena ^{[1
]}

Sheikin, Ilya ^{[4
]}

Paulsen, Carley ^{[5
]}

Knebel, Georg ^{[1
]}

Kotegawa, Hisashi ^{[1
]}

Flouquet, Jacques ^{[1
]}

机构：

[1] CEA Grenoble, INAC SPSMS, F-38054 Grenoble, France

[2] Japan Atom Energy Agcy, Adv Sci Res Ctr, Tokai, Ibaraki 3191195, Japan

[3] KIT Karlsruhe, Inst Festkorperphys, D-76021 Karlsruhe, Germany

[4] CNRS, LNCMI G, F-38042 Grenoble, France

[5] CNRS, Inst Neel, F-38042 Grenoble, France

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2011年 / 80卷

关键词：

ferromagnetism; superconductivity; URhGe; UCoGe; effective mass; ferromagnetic instability;

D O I：

10.1143/JPSJS.80SA.SA008

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We review our recent results on ferromagnetic superconductors, URhGe and UCoGe. High quality single crystals of both compounds were successfully grown. The specific heat shows a clear jump related to the superconducting transition in UCoGe. The finite values of C/T at 0 K are discussed in terms of the self-induced vortex state and the value of the ordered moment. With increasing fields for H parallel to b-axis in URhGe, the jump of thermal expansion increases and shifts to lower temperature. The re-entrant and S-shaped superconducting phases for URhGe and UCoGe respectively are explained by the unusual field dependence of the effective mass, which is induced by the ferromagnetic instability when the field is applied along the hard magnetization b-axis. The magnetic fluctuations are very sensitive to the field orientation. This is reflected in the H-c2 and the anisotropy of the effective mass.

引用

页数：6

共 37 条

[1] Coexistence of superconductivity and ferromagnetism in URhGe [J].