Abstract
Superconducting properties of single-crystalline $\mathrm{Ca}({\mathrm{Al}}_{0.5},{\mathrm{Si}}_{0.5}{)}_{2},$ which is isostructural to ${\mathrm{MgB}}_{2},$ were studied by measurements of electrical resistivity, Hall coefficient, and magnetization. $\mathrm{Ca}({\mathrm{Al}}_{0.5},{\mathrm{Si}}_{0.5}{)}_{2}$ is a type-II superconductor with a carrier density of $8.6\ifmmode\times\else\texttimes\fi{}{10}^{26}{\mathrm{e}\mathrm{l}\mathrm{e}\mathrm{c}\mathrm{t}\mathrm{r}\mathrm{o}\mathrm{n}\mathrm{s}/\mathrm{m}}^{3}$ at 290 K. The lower critical field ${H}_{C1}$ has a parabolic temperature dependence typical for conventional superconductors. The upper critical field ${(H}_{C2})$ anisotropy ratio has a temperature-independent value of 2.3. The Ginzburg-Landau (GL) parameter \ensuremath{\kappa}(0) is equal to 12 and 5.2 in the ab-plane and c-axis directions, respectively. The anisotropy of the critical fields can be well described by the anisotropic GL theory.
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