Broken time-reversal symmetry probed by muon spin relaxation in the caged type superconductor Lu5Rh6Sn18

被引：60

作者：

Bhattacharyya, A. ^{[1
,2
]}

Adroja, D. T. ^{[1
,2
]}

Quintanilla, J. ^{[1
,3
,4
]}

Hillier, A. D. ^{[1
]}

Kase, N. ^{[5
]}

Strydom, A. M. ^{[2
,6
]}

Akimitsu, J. ^{[5
]}

机构：

[1] Rutherford Appleton Lab, ISIS Facil, Didcot OX11 0QX, Oxon, England

[2] Univ Johannesburg, Dept Phys, Highly Correlated Matter Res Grp, ZA-2006 Johannesburg, South Africa

[3] Univ Kent, Sch Phys Sci, SEPnet, Canterbury CT2 7NH, Kent, England

[4] Univ Kent, Sch Phys Sci, Hubbard Theory Consortium, Canterbury CT2 7NH, Kent, England

[5] Aoyama Gakuin Univ, Dept Phys & Math, Sagamihara, Kanagawa 2525258, Japan

[6] Max Planck Inst Chem Phys Solids, D-01187 Dresden, Germany

来源：

PHYSICAL REVIEW B | 2015年 / 91卷 / 06期

关键词：

SR2RUO4; STATE;

D O I：

10.1103/PhysRevB.91.060503

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The superconducting state of the caged type compound Lu5Rh6Sn18 has been investigated by using magnetization, heat capacity, and muon spin relaxation or rotation (mu SR) measurements, and the results interpreted on the basis of the group theoretical classifications of the possible pairing symmetries and a simple model of the resulting quasiparticle spectra. Our zero-field mu SR measurements clearly reveal the spontaneous appearance of an internal magnetic field below the transition temperature, which indicates that the superconducting state in this material is characterized by broken time-reversal symmetry. Further, the analysis of the temperature dependence of the magnetic penetration depth measured using the transverse-field mu SR measurements suggests an isotropic s-wave character for the superconducting gap. This is in agreement with the heat capacity behavior, and we show that it can be interpreted in terms of a nonunitary triplet state with point nodes and an open Fermi surface.

引用

页数：5

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