Strong-coupling BCS superconductivity in noncentrosymmetric BaPtSi sub(3): a low-temperature study

We report on measurements of the temperature dependence of the magnetic penetration depth of a high-quality sample of BaPtSi sub(3) (T sub(c) = 2.25 K). We observe a temperature-independent behaviour below T [Asymptotically = to] 0.2 T sub(c), which is firm evidence for the presence of an isotropic...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2014-06, Vol.26 (23), p.1-3
Main Authors: Ribeiro-Palau, R, Caraballo, R, Rogl, P, Bauer, E, Bonalde, I
Format: Article
Language:English
Subjects:
Asymptotic properties
Condensed matter
Crystallization
Density
Fluids
Mathematical models
Superconductivity
Temperature dependence
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Summary:We report on measurements of the temperature dependence of the magnetic penetration depth of a high-quality sample of BaPtSi sub(3) (T sub(c) = 2.25 K). We observe a temperature-independent behaviour below T [Asymptotically = to] 0.2 T sub(c), which is firm evidence for the presence of an isotropic superconducting gap in this material. In the whole temperature range the superfluid density is described well by a strong-coupling Bardeen-Cooper-Schrieffer (BCS) model with an isotropic gap Delta sub(0) [asymptotically =] 2k sub(B)T sub(c). Our results provide further support for conventional BCS superconductivity in the nonmagnetic members of the noncentrosymmetric family of superconductors that crystallize with the BaNiSn sub(3)-type tetragonal structure.
ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/26/23/235701