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

Superconducting properties of single-crystalline Ca(Al_0.5, Si_0.5)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

Research output: Contribution to journal › Article › peer-review

41 Citations (Scopus)

Abstract

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 8.6×10²⁶ electrons/m³ at 290 K. The lower critical field HC1 has a parabolic temperature dependence typical for conventional superconductors. The upper critical field (H_C2) 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.

Original language	English
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	68
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevB.68.064512
Publication status	Published - 2003
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.68.064512

Cite this

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title = "Superconducting properties of single-crystalline Ca(Al0.5, Si0.5)2: A ternary silicide with the AlB2-type structure",

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{\texttimes}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.",

author = "Motoharu Imai and Sadki, \{El Hadi S.\} and Hideki Abe and Kenji Nishida and Takashi Kimura and Taku Sato and Kazuto Hirata and Hideaki Kitazawa",

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T2 - A ternary silicide with the AlB2-type structure

AU - Imai, Motoharu

AU - Sadki, El Hadi S.

AU - Abe, Hideki

AU - Nishida, Kenji

AU - Kimura, Takashi

AU - Sato, Taku

AU - Hirata, Kazuto

AU - Kitazawa, Hideaki

PY - 2003

Y1 - 2003

N2 - 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.

AB - 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.

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Superconducting properties of single-crystalline Ca(Al_0.5, Si_0.5)₂: A ternary silicide with the AlB₂-type structure

Abstract

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