First Observation of Quantum Oscillations in the Ferromagnetic Superconductor UCoGe

被引：32

作者：

Aoki, Dai ^{[1
]}

Sheikin, Ilya ^{[2
]}

Matsuda, Tatsuma D. ^{[1
,3
]}

Taufour, Valentin ^{[1
]}

Knebel, Georg ^{[1
]}

Flouquet, Jacques ^{[1
]}

机构：

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

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

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

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2011年 / 80卷 / 01期

关键词：

unconventional superconductivity; Fermi surface; Shubnikov-de Haas effect; upper critical field; quantum criticality; effective mass; ferromagnetism; UCoGe; METAMAGNETIC TRANSITION; FERMI-SURFACE; VAN-ALPHEN; FIELD; URHGE; UGE2;

D O I：

10.1143/JPSJ.80.013705

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We succeeded in growing high quality single crystals of the ferromagnetic superconductor UCoGe and measured the magnetoresistance at fields up to 34 T. The Shubnikov-de Haas signal was observed for the first time in a U-111 system (UTGe, UTSi, T: transition metal). A small pocket Fermi surface (F similar to 1 kT) with large cyclotron effective mass 25 m(0) was detected at high fields above 22 T, implying that UCoGe is a low carrier system accompanyed with heavy quasi-particles. The observed frequency decreases with increasing fields, indicating that the volume of detected Fermi surface changes nonlinearly with field. The cyclotron mass also decreases, which is consistent with the decrease of the A coefficient of resistivity.

引用

页数：4

共 31 条

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