Growth and structural characterization of superconducting Ba1-xKxBiO3 single crystals

L. F. Schneemeyer, J. K. Thomas, T. Siegrist, B. Batlogg, L. W. Rupp, R. L. Opila, R. J. Cava, D. W. Murphy

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Abstract

Superconductivity near 30 K was discovered recently in a copper-free phase, Ba1-xKxBiO3 (refs 1, 2). This material has structural and electronic properties in common with both the cuprate high-transition-temperature (high-Tc) superconductors and with BaPb1-xBixO3, which has a Tc of ∼12 K (ref. 4). Here we report the growth and structural characterization of single crystals of Ba1-xKxBiO3. A maximum Tc of 30.5 K is found from d.c. susceptibility measurements for crystals of approximate composition Ba0.6K0.4BiO3. The structure for a crystal with x = 0.37 is determined by X-ray diffraction and is found to be a simple cubic perovskite with a = 4.2869 (6) Å. A commensurate lattice distortion occurs for x = 0.04, which is identified as a distortion of the BiO6 octahedra. Effects of structural distortions and concomitant changes in electronic properties in this non-magnetic system may contain clues to the role of phonons and electronic interactions in the microscopic pairing mechanism of high-Tc superconductors.

Original languageEnglish (US)
Pages (from-to)421-423
Number of pages3
JournalNature
Volume335
Issue number6189
DOIs
StatePublished - 1988
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General

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