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

Ruslan Prozorov·Tyson A. Olheiser·Russell W. Giannetta·Kentaro Uozato·Tsuyoshi Tamegai
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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.

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Ruslan Prozorov, Tyson A. Olheiser, Russell W. Giannetta, Kentaro Uozato, Tsuyoshi Tamegai. 2006-04-16. Anisotropic s-wave superconductivity in single crystals CaAlSi from penetration depth measurements. https://doi.org/10.1103/physrevb.73.184523

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