Missing superconductivity in BaAlSi with the AlB2 type structure

Shoji Yamanaka, Teruyoshi Otsuki, Takayuki Ide, Hiroshi Fukuoka, Ryotaro Kumashiro, Takeshi Rachi, Katsumi Tanigaki, Fang Zhun Guo, Keisuke Kobayashi

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

The solid solutions BaAl1-xSi1+x (0 ≤ x ≤ 0.5) were prepared. The compound with the stoichiometric composition (x = 0) did not show superconductivity as reported by other investigators, but the solid solutions with x > 0 became superconductors with a transition temperature Tc = 2.8 K. The comparison of the lattice parameters with those of the other isotypic ternary superconductors MAlSi (M = Ca, Sr) suggested that the superconductivity could be related to the lattice parameter within the (AlSi) plane rather than the interlayer spacing. The band structures near the Fermi level of MAlSi (M = Ca, Sr, Ba) were measured using soft X-ray photoelectron spectroscopy, which were in good agreement with the calculated ones, confirming that the contribution of the d orbitals of the alkaline-earth metals were predominant in the conduction bands.

Original languageEnglish
Pages (from-to)19-23
Number of pages5
JournalPhysica C: Superconductivity and its applications
Volume451
Issue number1
DOIs
Publication statusPublished - 2007 Jan 1

Keywords

  • AlB type structure
  • BaAlSi
  • CaAlSi
  • SrAlSi
  • Superconductivity

ASJC Scopus subject areas

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

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