TY - JOUR
T1 - Study of binary and pseudo-binary intermetallic compounds with AlB2 structure
AU - Meng, R. L.
AU - Lorenz, B.
AU - Wang, Y. S.
AU - Cmaidalka, J.
AU - Sun, Y. Y.
AU - Xue, Y. Y.
AU - Meen, J. K.
AU - Chu, C. W.
N1 - Funding Information:
The work in Houston is supported in part by NSF grant no. DMR-9804325, the MRSEC Program of the National Science Foundation award no. DMR-9632667, 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 - 2002/10/15
Y1 - 2002/10/15
N2 - We have synthesized and studied the binary intermetallic compounds, AGa2 and A[GaxSi2-x] (A = Sr, Ba, Ca), which are isostructural to the newly discovered 40 K superconductor MgB2. The binary compounds AGa2 were found to be non-superconducting above 2 K, even though they have the same valence electron number per formula as MgB2 and greater lattice parameters than MgB2. However, by varying the valence electron number, they become superconducting. This result suggests that the electronic structures of this class of compounds depend on more than just the valence electron density and the lattice parameters. The theoretical prediction that the Tc of MgB2 could be enhanced with the proper dopant to increase its carrier density or to expand the lattice could not be verified.
AB - We have synthesized and studied the binary intermetallic compounds, AGa2 and A[GaxSi2-x] (A = Sr, Ba, Ca), which are isostructural to the newly discovered 40 K superconductor MgB2. The binary compounds AGa2 were found to be non-superconducting above 2 K, even though they have the same valence electron number per formula as MgB2 and greater lattice parameters than MgB2. However, by varying the valence electron number, they become superconducting. This result suggests that the electronic structures of this class of compounds depend on more than just the valence electron density and the lattice parameters. The theoretical prediction that the Tc of MgB2 could be enhanced with the proper dopant to increase its carrier density or to expand the lattice could not be verified.
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U2 - 10.1016/S0921-4534(02)01208-X
DO - 10.1016/S0921-4534(02)01208-X
M3 - Article
AN - SCOPUS:0037107957
SN - 0921-4534
VL - 382
SP - 113
EP - 116
JO - Physica C: Superconductivity and its applications
JF - Physica C: Superconductivity and its applications
IS - 1
ER -