Strong-coupling BCS superconductivity in noncentrosymmetric BaPtSi3: a low-temperature study.
We report on measurements of the temperature dependence of the magnetic penetration depth of a high-quality sample of BaPtSi3 (Tc = 2.25 K). We observe a temperature-independent behaviour below T ≃ 0.2 Tc, 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 Δ0 ≈ 2kBTc. Our results provide further support for conventional BCS superconductivity in the nonmagnetic members of the noncentrosymmetric family of superconductors that crystallize with the BaNiSn3-type tetragonal structure.
Centro de Física, Instituto Venezolano de Investigaciones Científicas, Apartado 20632, Caracas 1020-A, Venezuela.
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Ribeiro-Palau
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Caraballo
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Rogl
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E
Bauer
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Bonalde
D016880:Anisotropy; D017609:Barium Compounds / Q000737:chemistry*; D003080:Cold Temperature; D003461:Crystallography; D004553:Electric Conductivity; D004583:Electrons; D008280:Magnetics; D008962:Models, Theoretical; D015394:Molecular Structure; D010984:Platinum / Q000737:chemistry*; D012825:Silicon / Q000737:chemistry*; D055672:Static Electricity
D017609:Barium Compounds; D010984:Platinum; D012825:Silicon