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Superconducting properties of single-crystalline Ca(Al0.5,Si0.5)2:: A ternary silicide with the AlB2-type structure -: art. no. 064512
被引:38
|作者:
Imai, M
[1
]
Sadki, EHS
[1
]
Abe, H
[1
]
Nishida, K
[1
]
Kimura, T
[1
]
Sato, T
[1
]
Hirata, K
[1
]
Kitazawa, H
[1
]
机构:
[1] Natl Inst Mat Sci, Tsukuba, Ibaraki 3050047, Japan
关键词:
D O I:
10.1103/PhysRevB.68.064512
中图分类号:
T [工业技术];
学科分类号:
08 ;
摘要:
Superconducting properties of single-crystalline Ca(Al-0.5,Si-0.5)(2), which is isostructural to MgB2, were studied by measurements of electrical resistivity, Hall coefficient, and magnetization. Ca(Al-0.5,Si-0.5)(2) is a type-II superconductor with a carrier density of 8.6x10(26) electrons/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 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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