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Anisotropic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>s</mml:mi></mml:math>-wave superconductivity in CaAlSi single crystals from penetration depth measurements
In- and out-of-plane London penetration depths were measured in CaAlSi single crystals (${T}_{c}=6.2$ and $7.3\phantom{\rule{0.3em}{0ex}}\mathrm{K}$) using a tunnel-diode resonator. A full three-dimensional (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 …