Superconducting properties of single-crystalline Ca(Al0.5,Si0.5)2: A ternary silicide with the AlB2-type structure
Motoharu Imai, El-Hadi S. Sadki, Hideki Abe, Kenji Nishida, Takashi Kimura, Taku Sato, Kazuto Hirata, Hideaki Kitazawa
DOI 10.1103/PhysRevB.68.064512 · Physical Review B
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Abstract
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 8.6×1026electrons/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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ca(Al0.5Si0.5)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.1 | Pressure unresolved | onset |
| Ca(Al0.5Si0.5)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.8 | Pressure unresolved | unknown |
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 39 | Pressure not reported | unknown |
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