The specific heat of Ba0.6K0.4BiO3 below 2K

N. E. Hussey, J. P. Wakelin, D. F. Brewer, T. E. Hargreaves, C. S. McMenamin, A. L. Thomson, K. Prassides

Research output: Contribution to journalArticlepeer-review

Abstract

We have measured the specific heat C of a polycrystalline sample of the non-cuprate superconductor Ba0.6K0.4BiO3 (Tc ≈ 27K) from T = 1.8K down to T = 0.1K. The data could be fitted accurately to the expression C = AT-2 + αTn + βT3 where n = 0.53 ± 0.10. The nuclear term (AT-2) is attributed to the presence of a crystalline electric field gradient on the Bi nuclei. The residual specific heat term (αTn) has also been observed in the low temperature specific heat of several cuprate high-Tc superconductors (0.3 ≤ n ≤ 1) suggesting a possible common origin in all of these systems.

Original languageEnglish
Pages (from-to)1973-1974
Number of pages2
JournalPhysica B: Physics of Condensed Matter
Volume194-196
Issue numberPART 2
DOIs
Publication statusPublished - 1994 Feb 2

ASJC Scopus subject areas

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

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