Anisotropic s-wave superconductivity in single crystals CaAlSi from penetration depth measurements
arXiv:cond-mat/0602635 · doi:10.1103/PhysRevB.73.184523
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