Physics – Condensed Matter – Superconductivity
Scientific paper
2005-03-29
Physics
Condensed Matter
Superconductivity
11 pages, 5 figures
Scientific paper
The specific heats of three samples of Na0.35CoO2,1.3H2O show an evolution of the superconductivity, and its ultimate disappearance, with increasing sample age. An overall 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 in the CoO2 layers and the formation of O vacancies suggests a relation between the two effects and an explanation for the strong sample dependence of the properties of this material more generally. The onset of the transition to the vortex state is independent of magnetic field, suggesting the presence of unusually strong fluctuation effects.
Cava Robert. J.
Fisher Russell A.
Foo Maw Lin
Gordon John E.
Oechsler N.
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