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SPECIFIC HEAT OF THE HIGH-TRANSITION TEMPERATURE OXIDE SUPERCONDUCTORS.

Author(s) : FISHER R. A., GORDON J. E., PHILLIPS N. E.

Type of article: Article

Summary

THE AUTHORS REVIEW THE SPECIFIC HEAT MEASUREMENTS ON LCO, LMCO (M = CALCIUM, STRONTIUM AND BARIUM), YBCO AND THE BCSCO AND TCBCO SYSTEMS. TABLES OF PROPERTIES DERIVED FROM THE DATA ARE PRESENTED. RESULTS ON RBCO (R = RARE EARTH ELEMENTS OTHER THAN YTTRIUM) ARE SUMMARIZED, AS ARE RESULTS ON YBCO DOPED WITH ZINC, CHROMIUM, IRON OR NICKEL. THE DIFFICULTIES OF ANALYZING THE SPECIFIC HEAT DATA, AND SPECIFICALLY THE SEPARATION OF THE CONTRIBUTIONS ASSOCIATED WITH MAGNETIC IMPURITIES, ARE DISCUSSED. IT IS TENTATIVELY CONCLUDED THAT THE DATA NEAR THE CRITICAL TEMPERATURE ARE CONSISTENT WITH BCS THEORY, ALTHOUGH THEY SHOW EVIDENCE OF FLUCTUATION EFFECTS. IT IS ALSO CONCLUDED THAT THE LOW-TEMPERATURE ZERO-FIELD DATA ON A MAJORITY OF THE HIGH-CRITICAL TEMPERATURE OXIDE SUPERCONDUCTORS PROVIDE EVIDENCE OF AN INTRINSIC TERM THAT IS PROPORTIONAL TO T, A RESULT THAT IS INCONSISTENT WITH A GAP IN THE ELECTRONIC DENSITY OF STATES.

Details

  • Original title: SPECIFIC HEAT OF THE HIGH-TRANSITION TEMPERATURE OXIDE SUPERCONDUCTORS.
  • Record ID : 1990-0951
  • Languages: English
  • Source: J. Supercond. - vol. 1 - n. 3
  • Publication date: 1988/09
  • Document available for consultation in the library of the IIR headquarters only.

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