Superconducting Pairs with Extreme Uniaxial Anisotropy in URu2Si2

被引：43

作者：

Altarawneh, M. M. ^{[1
,2
]}

Harrison, N. ^{[1
]}

Li, G. ^{[3
]}

Balicas, L. ^{[3
]}

Tobash, P. H. ^{[1
]}

Ronning, F. ^{[1
]}

Bauer, E. D. ^{[1
]}

机构：

[1] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

[2] Mutah Univ, Dept Phys, Mutah 61710, Karak, Jordan

[3] Natl High Magnet Field Lab, Tallahassee, FL 32310 USA

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 108卷 / 06期

基金：

美国国家科学基金会;

关键词：

CRYSTALLINE ELECTRIC-FIELD; HEAVY; SYSTEM; LATTICE; STATE; ORDER;

D O I：

10.1103/PhysRevLett.108.066407

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report magnetic field orientation-dependent measurements of the superconducting upper critical field in high quality single crystals of URu2Si2 and find the effective g factor estimated from the Pauli limit to agree remarkably well with that found in quantum oscillation experiments, both quantitatively and in the extreme anisotropy (approximate to 10(3)) of the spin susceptibility. Rather than a strictly itinerant or purely local f-electron picture being applicable, the latter suggests the quasiparticles subject to pairing in URu2Si2 to be "composite heavy fermions" formed from bound states between conduction electrons and local moments with a protected Ising behavior. Non-Kramers doublet local magnetic degrees of freedom suggested by the extreme anisotropy favor a local pairing mechanism.

引用

页数：5

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