Extended range of superconducting bismuthates K1-xAxBiO3 (A = La, Bi, and Ca)

N. R. Khasanova, K. Yoshida, A. Yamamoto, S. Tajima

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Abstract

Synthesis and physical properties of new superconducting bismuthates, K1-xAxBiO3 (A=Bi, La, and Ca), are reported. New compounds could only be prepared in a narrow range of composition, restricted by the A-site cation size, with cubic perovskite structure. For the first two systems (A = Bi, La), Tc was found to depend strongly on composition and was enhanced upon heterovalent substitution. The data obtained and comparison with known bismuthates show undoubtedly that band filling controlled by dopant concentration is a crucial parameter for variation of Tc in this class of materials.

Original languageEnglish
Pages (from-to)12-22
Number of pages11
JournalPhysica C: Superconductivity and its applications
Volume356
Issue number1-2
DOIs
Publication statusPublished - 2001 Jan 7

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Keywords

  • Bismuthates
  • High-pressure technique
  • 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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