Study of binary and pseudo-binary intermetallic compounds with AlB2 structure

R. L. Meng, B. Lorenz, Y. S. Wang, J. Cmaidalka, Y. Y. Sun, Y. Y. Xue, J. K. Meen, C. W. Chu

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)113-116
Number of pages4
JournalPhysica C: Superconductivity and its applications
Issue number1
Publication statusPublished - 2002 Oct 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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