Superconductivity in the C32 intermetallic compounds AAl2-xSix, with A = Ca and Sr; and 0.6 < x < 1.2

B. Lorenz; J. Lenzi; J. Cmaidalka; R. L. Meng; Y. Y. Sun; Y. Y. Xue; C. W. Chu

doi:10.1016/S0921-4534(02)02056-7

Superconductivity in the C32 intermetallic compounds AAl_2-xSi_x, with A = Ca and Sr; and 0.6 < x < 1.2

B. Lorenz
, J. Lenzi
, J. Cmaidalka
, R. L. Meng
, Y. Y. Sun
, Y. Y. Xue
, C. W. Chu

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Abstract

The intermetallic compounds AAl_2-xSi_x, where A = Ca, Sr or Ba, crystallize in the C32 structure, same as the recently discovered MgB₂ with a high superconducting transition temperature of 39 K. For x = 1, superconductivity has been observed in AAlSi with A = Ca and Sr, but not with A = Ba. The transition temperatures are 7.8 and 5.1 K, respectively for CaAlSi and SrAlSi. The CaAl_2-xSi_x compound system display a T_c-peak at x = 1, a possible x-induced electronic transition at x ∼ 0.75 and a possible miscibility gap near x ∼ 1.1 which results in a very broad superconducting transition. The Seebeck coefficients of AAlSi indicate that their carriers are predominantly electrons in nature, in contrast to the holes in MgB₂.

Original language	English
Pages (from-to)	191-196
Number of pages	6
Journal	Physica C: Superconductivity and its Applications
Volume	383
Issue number	3
DOIs	https://doi.org/10.1016/S0921-4534(02)02056-7
Publication status	Published - 2002 Dec 15

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

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title = "Superconductivity in the C32 intermetallic compounds AAl2-xSix, with A = Ca and Sr; and 0.6 < x < 1.2",

abstract = "The intermetallic compounds AAl2-xSix, where A = Ca, Sr or Ba, crystallize in the C32 structure, same as the recently discovered MgB2 with a high superconducting transition temperature of 39 K. For x = 1, superconductivity has been observed in AAlSi with A = Ca and Sr, but not with A = Ba. The transition temperatures are 7.8 and 5.1 K, respectively for CaAlSi and SrAlSi. The CaAl2-xSix compound system display a Tc-peak at x = 1, a possible x-induced electronic transition at x ∼ 0.75 and a possible miscibility gap near x ∼ 1.1 which results in a very broad superconducting transition. The Seebeck coefficients of AAlSi indicate that their carriers are predominantly electrons in nature, in contrast to the holes in MgB2.",

author = "B. Lorenz and J. Lenzi and J. Cmaidalka and Meng, \{R. L.\} and Sun, \{Y. Y.\} and Xue, \{Y. Y.\} and Chu, \{C. W.\}",

note = "Funding Information: This work is supported in part by NSF grant no. DMR-9804325, the T.L.L. Temple Foundation, the John J. and Rebecca Moores Endowment, and the State of Texas through the Texas Center for Superconductivity at the University of Houston and at Lawrence Berkeley Laboratory by the Director, Office of Energy Research, Office of Basic Energy Sciences, Division of Materials Sciences of the US Department of Energy under contract no. DE-AC03-76SF00098.",

year = "2002",

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doi = "10.1016/S0921-4534(02)02056-7",

language = "English",

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journal = "Physica C: Superconductivity and its Applications",

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T1 - Superconductivity in the C32 intermetallic compounds AAl2-xSix, with A = Ca and Sr; and 0.6 < x < 1.2

AU - Lorenz, B.

AU - Lenzi, J.

AU - Cmaidalka, J.

AU - Meng, R. L.

AU - Sun, Y. Y.

AU - Xue, Y. Y.

AU - Chu, C. W.

N1 - Funding Information: This work is supported in part by NSF grant no. DMR-9804325, the T.L.L. Temple Foundation, the John J. and Rebecca Moores Endowment, and the State of Texas through the Texas Center for Superconductivity at the University of Houston and at Lawrence Berkeley Laboratory by the Director, Office of Energy Research, Office of Basic Energy Sciences, Division of Materials Sciences of the US Department of Energy under contract no. DE-AC03-76SF00098.

PY - 2002/12/15

Y1 - 2002/12/15

N2 - The intermetallic compounds AAl2-xSix, where A = Ca, Sr or Ba, crystallize in the C32 structure, same as the recently discovered MgB2 with a high superconducting transition temperature of 39 K. For x = 1, superconductivity has been observed in AAlSi with A = Ca and Sr, but not with A = Ba. The transition temperatures are 7.8 and 5.1 K, respectively for CaAlSi and SrAlSi. The CaAl2-xSix compound system display a Tc-peak at x = 1, a possible x-induced electronic transition at x ∼ 0.75 and a possible miscibility gap near x ∼ 1.1 which results in a very broad superconducting transition. The Seebeck coefficients of AAlSi indicate that their carriers are predominantly electrons in nature, in contrast to the holes in MgB2.

AB - The intermetallic compounds AAl2-xSix, where A = Ca, Sr or Ba, crystallize in the C32 structure, same as the recently discovered MgB2 with a high superconducting transition temperature of 39 K. For x = 1, superconductivity has been observed in AAlSi with A = Ca and Sr, but not with A = Ba. The transition temperatures are 7.8 and 5.1 K, respectively for CaAlSi and SrAlSi. The CaAl2-xSix compound system display a Tc-peak at x = 1, a possible x-induced electronic transition at x ∼ 0.75 and a possible miscibility gap near x ∼ 1.1 which results in a very broad superconducting transition. The Seebeck coefficients of AAlSi indicate that their carriers are predominantly electrons in nature, in contrast to the holes in MgB2.

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DO - 10.1016/S0921-4534(02)02056-7

M3 - Article

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SN - 0921-4534

VL - 383

SP - 191

EP - 196

JO - Physica C: Superconductivity and its Applications

JF - Physica C: Superconductivity and its Applications

IS - 3

ER -

Superconductivity in the C32 intermetallic compounds AAl_2-xSi_x, with A = Ca and Sr; and 0.6 < x < 1.2

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