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

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.

References in corpus (8)

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Cited by in corpus (10)

• Recent progress on superconductors with time-reversal symmetry breaking
• Superconductivity in Hexagonal BaPtAs: SrPtSb- and YPtAs-type Structures with Ordered Honeycomb Network
• Possibility of chiral $d$-wave state in the hexagonal pnictide superconductor SrPtAs
• Superconductivity in BaPtSb with an Ordered Honeycomb Network
• Surface magnetism in a chiral d-wave superconductor with hexagonal symmetry
• Robustness of chiral surface current and subdominant $s$-wave Cooper pairs
• Phenomenology of the chiral $d$-wave state in the hexagonal pnictide superconductor SrPtAs
• Study on Susceptibilities of Superconductors BaPtSb and BaPtAs with Honeycomb Structure
• Spontaneous magnetic field and disorder effects in BaPtAs_1-x_Sb_x_ with honeycomb network
• Possible Pairing Symmetry of BaPtAs${}_{1-x}$Sb${}_x$ with an Ordered Honeycomb Network