Evidence for conventional superconducting behavior in noncentrosymmetric Mo3Al2C

被引：31

作者：

Bonalde, I. ^{[1
]}

Kim, H. ^{[2
,3
]}

Prozorov, R. ^{[2
,3
]}

Rojas, C. ^{[4
]}

Rogl, P. ^{[5
]}

Bauer, E. ^{[5
]}

机构：

[1] Inst Venezolano Invest Cient, Ctr Fis, Caracas 1020A, Venezuela

[2] Iowa State Univ, Ames Lab, Ames, IA 50011 USA

[3] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA

[4] Cent Univ Venezuela, Dept Fis, Fac Ciencias, Caracas 1041A, Venezuela

[5] Vienna Univ Technol, Inst Festkorperphys, A-1040 Vienna, Austria

来源：

PHYSICAL REVIEW B | 2011年 / 84卷 / 13期

关键词：

MAGNETIC-FIELD;

D O I：

10.1103/PhysRevB.84.134506

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report on measurements of the magnetic penetration depth of polycrystalline samples of nonmagnetic Mo3Al2C (T-c = 9 K) without inversion symmetry. Two previous specific-heat measurements in this compound found different anomalous peaks in the low-temperature limit. One of these peaks was attributed to the superconducting transition at 3 K of the impurity phase Mo2C. We argue here that the second anomalous peak may be caused by the superconducting transition of SiC:Al at 1.45 K, another impurity phase possibly present in Mo3Al2C samples. The temperature-independent behavior of the penetration depth observed below 0.5 K is taken as firm evidence for the presence of a nodeless superconducting gap in Mo3Al2C. Numerical calculations using the BCS expression for the penetration depth give qualitative support for an isotropic energy gap in Mo3Al2C. The present results suggest that Mo3Al2C is a conventional s-wave superconductor, although two-gap or anisotropic-gap superconductivity cannot be ruled out.

引用

页数：4

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