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arXiv · 1602.08060

High-resolution magnetic penetration depth and inhomogeneities in locally noncentrosymmetric SrPtAs

J. F. Landaeta·S. V. Taylor·I. Bonalde·C. Rojas·Y. Nishikubo·K. Kudo·M. Nohara
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Abstract

We present a magnetic-penetration-depth study on polycrystalline and granular samples of SrPtAs, a pnictide superconductor with a hexagonal structure containing PtAs layers that individually break inversion symmetry (local noncentrosymmetry). Compact samples show a clear-cut s-wave-type BCS behavior, which we consider to be the intrinsic penetration depth of SrPtAs. Granular samples display a sample-dependent second diamagnetic drop, attributed to the intergrain coupling. Our experimental results point to a nodeless isotropic superconducting energy gap in SrPtAs, which puts strong constraints on the driven mechanism for superconductivity and the order parameter symmetry of this compound.

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J. F. Landaeta, S. V. Taylor, I. Bonalde, C. Rojas, Y. Nishikubo, K. Kudo, M. Nohara. 2016-02-25. High-resolution magnetic penetration depth and inhomogeneities in locally noncentrosymmetric SrPtAs. https://doi.org/10.1103/physrevb.93.064504

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