Evidence for two-band superconductivity and non-magnetic pair breaking in Na0.3CoO2·1.3H2O; Effects of sample age

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

doi:10.1209/0295-5075/82/47011

Evidence for two-band superconductivity and non-magnetic pair breaking in Na_0.3CoO₂·1.3H₂O; Effects of sample age

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

Research output: Contribution to journal › Article › peer-review

6 Scopus citations

Abstract

The specific heat of Na_0.3CoO₂1.3H₂O gives evidence of two electron bands with comparable densities of states and different superconducting-state energy gaps. A non-magnetic pair-breaking action, which acts preferentially in the band with the smaller gap, progresses with sample age. The two bands and non-magnetic pair breaking have implications for possible pairing mechanisms; the effects of the pair breaking constitute the "sample dependence" of the properties of this material. In concert with structural changes reported by others, the specific heat suggests dual roles for O vacancies - tuning the carrier concentration to favor superconductivity, and pair breaking to destroy it.

Original language	English (US)
Article number	47011
Journal	EPL
Volume	82
Issue number	4
DOIs	https://doi.org/10.1209/0295-5075/82/47011
State	Published - May 1 2008

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

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T1 - Evidence for two-band superconductivity and non-magnetic pair breaking in Na0.3CoO2·1.3H2O; Effects of sample age

AU - Oeschler, N.

AU - Fisher, R. A.

AU - Phillips, N. E.

AU - Gordon, J. E.

AU - Foo, M. L.

AU - Cava, R. J.

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N2 - The specific heat of Na0.3CoO21.3H2O gives evidence of two electron bands with comparable densities of states and different superconducting-state energy gaps. A non-magnetic pair-breaking action, which acts preferentially in the band with the smaller gap, progresses with sample age. The two bands and non-magnetic pair breaking have implications for possible pairing mechanisms; the effects of the pair breaking constitute the "sample dependence" of the properties of this material. In concert with structural changes reported by others, the specific heat suggests dual roles for O vacancies - tuning the carrier concentration to favor superconductivity, and pair breaking to destroy it.

AB - The specific heat of Na0.3CoO21.3H2O gives evidence of two electron bands with comparable densities of states and different superconducting-state energy gaps. A non-magnetic pair-breaking action, which acts preferentially in the band with the smaller gap, progresses with sample age. The two bands and non-magnetic pair breaking have implications for possible pairing mechanisms; the effects of the pair breaking constitute the "sample dependence" of the properties of this material. In concert with structural changes reported by others, the specific heat suggests dual roles for O vacancies - tuning the carrier concentration to favor superconductivity, and pair breaking to destroy it.

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Evidence for two-band superconductivity and non-magnetic pair breaking in Na_0.3CoO₂·1.3H₂O; Effects of sample age

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