Unconventional superconducting properties of noncentrosymmetric Re5.5Ta

被引：14
作者：
Arushi [1 ]
Singh, D. [2 ]
Biswas, P. K. [2 ]
Hillier, A. D. [2 ]
Singh, R. P. [1 ]
机构：
[1] Indian Inst Sci Educ & Res Bhopal, Dept Phys, Bhopal 462066, India
[2] STFC Rutherford Appleton Lab, ISIS Facil, Didcot OX11 0QX, Oxon, England
来源：
PHYSICAL REVIEW B | 2020年 / 101卷 / 14期
关键词：
CRITICAL-FIELD; PURITY DEPENDENCE; PENETRATION DEPTH; SPIN; TEMPERATURE; TC;
D O I：
10.1103/PhysRevB.101.144508
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Rhenium based noncentrosymmetric superconductors crystallizing in alpha-Mn structure have become potential candidates to exhibit an unconventional superconducting ground state. Here we report a detailed investigation on the superconducting and normal state properties of Re5.5Ta, that also has the alpha-Mn structure. Magnetization, specific heat, and transport measurements confirm the bulk superconducting transition T-C at 8.0 K. Upper critical field value [H-C2(0)] calculated from magnetization, specific heat, and AC transport measurements exceed the Pauli paramagnetic limit (14.7 T), indicating that the superconducting properties of Re5.5Ta are probably unconventional in nature. However, low-temperature specific heat and transverse-field muon spin rotation measurements suggest a surprising nodeless isotropic superconducting gap, although with strong electron-phonon coupling.
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页数：9
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