Anisotropic s-wave superconductivity in single crystals CaAlSi from penetration depth measurements
Ruslan Prozorov, Tyson A. Olheiser, Russell W. Giannetta, Kentaro Uozato, Tsuyoshi Tamegai
Abstract
In- and out-of-plane London penetration depths were measured in single crystals CaAlSi (Tc=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 Tc samples.
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