Anisotropic s-wave superconductivity in single crystals CaAlSi from penetration depth measurements

Abstract

In- and out-of-plane London penetration depths were measured in single crystals CaAlSi (T_{c}=6.2 K and 7.3 K) using a tunnel-diode resonator. A full 3D BCS analysis of the superfluid density is consistent with a prolate spheroidal gap, with a weak-coupling BCS value in the ab-plane and stronger coupling along the c-axis. The gap anisotropy was found to significantly decrease for higher T_{c} samples.

4 pages

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• Sub-THz electrodynamics of the graphene-like superconductor CaAlSi
• Pressure effects on the superconducting transition in nH-CaAlSi
• Specific Heat and Upper Critical Field of Sc5Ir4Si10 Superconductor
• First-Order Reorientation of the Flux-Line Lattice in CaAlSi
• The study on penetration depth of anisotropic two-band s-wave superconductors by Ginzburg-Landau approach