Specific-heat of Na0.35CoO2 · 1.3H2O: Effects of sample age and pair breaking on two-gap superconductivity

N. E. Phillips, N. Oeschler, R. A. Fisher, J. E. Gordon, M. L. Foo, R. J. Cava

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2 Scopus citations


Specific-heat measurements on Na0.35CoO2 · 1.3H2O show an evolution of the superconductivity, and its ultimate disappearance, with increasing sample age. An increase in pair breaking action, which occurs preferentially in an electron band with a small energy-gap, produces a shift in the relative contributions of two electron bands to the superconducting condensation. The similarity of the time scale for these changes to that recently reported for structural changes suggests a relation between the two effects and a basis for understanding the sample dependence of the properties of this material in general.

Original languageEnglish (US)
Pages (from-to)473-474
Number of pages2
JournalPhysica C: Superconductivity and its applications
Volume460-462 I
Issue numberSPEC. ISS.
StatePublished - Sep 1 2007

All Science Journal Classification (ASJC) codes

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


  • Cobaltate
  • Pair breaking
  • Sample-dependent
  • Superconductivity
  • Two-gap


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