Thermodynamic properties in the normal and superconducting states of Na xCoO 2 · yH 2O powder measured by heat capacity experiments

B. Lorenz, J. Cmaidalka, R. L. Meng, C. W. Chu

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23 Citations (Scopus)

Abstract

The heat capacity of superconducting Na xCoO 2· yH 2O was measured and the data are discussed based on two different models: The BCS theory and a model including the effects of line nodes in the superconducting gap function. The electronic heat capacity is separated from the lattice contribution in a thermodynamically consistent way maintaining the entropy balance of superconducting and normal states at the critical temperature. It is shown that for a fully gapped superconductor the data can only be explained by a reduced (≈50%) superconducting volume fraction. The data are compatible with 100% superconductivity in the case where line nodes are present in the superconducting gap function.

Original languageEnglish
Pages (from-to)106-113
Number of pages8
JournalPhysica C: Superconductivity and its applications
Volume402
Issue number1-2
DOIs
Publication statusPublished - 2004 Feb 1

All Science Journal Classification (ASJC) codes

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

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