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The temperature ($T$) and magnetic field ($H$) dependence of the magneticpenetration depth, $\lambda(T,H)$, in Ca(Al$_{0.5}$Si$_{0.5}$)$_2$ exhibitssignificant deviation from that expected for conventional BCS superconductors.In particular, it is inferred from a field dependence of $\lambda(H)$ ($\proptoH$) at 2.0 K that the quasiparticle excitation is strongly enhanced by theDoppler shift. This suggests that the superconducting order parameter inCa(Al$_{0.5}$Si$_{0.5}$)$_2$ is characterized by a small energy scale$\Delta_S/k_B\le 2$ K originating either from anisotropy or multi-gapstructure.Comment: 4 pages, 4 figures, submitted to J. Phys. Soc. Jp

Unconventional Behavior of Field-induced Quasiparticle Excitation in Ca(Al0.5Si0.5)2

Unconventional Behavior of Field-induced Quasiparticle Excitation in Ca(Al_0.5Si_0.5)₂