TY - JOUR
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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U2 - 10.1016/S0921-4534(02)02056-7
DO - 10.1016/S0921-4534(02)02056-7
M3 - Article
AN - SCOPUS:0037114341
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 -