Superconducting properties of single-crystalline Ca(Al0.5, Si0.5)2, which is isostructural to MgB2, were studied by measurements of electrical resistivity, Hall coefficient, and magnetization. Ca(Al0.5, Si0.5)2 is a type-II superconductor with a carrier density of 8.6×1026 electrons/m3 at 290 K. The lower critical field HC1 has a parabolic temperature dependence typical for conventional superconductors. The upper critical field (HC2) anisotropy ratio has a temperature-independent value of 2.3. The Ginzburg-Landau (GL) parameter κ(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.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 2003|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics