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

doi:10.1016/j.physc.2007.03.039

Specific-heat of Na_0.35CoO₂ · 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

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

2 Scopus citations

Abstract

Specific-heat measurements on Na_0.35CoO₂ · 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 language	English (US)
Pages (from-to)	473-474
Number of pages	2
Journal	Physica C: Superconductivity and its applications
Volume	460-462 I
Issue number	SPEC. ISS.
DOIs	https://doi.org/10.1016/j.physc.2007.03.039
State	Published - 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

Keywords

Cobaltate
Pair breaking
Sample-dependent
Superconductivity
Two-gap

Access to Document

10.1016/j.physc.2007.03.039

Cite this

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

abstract = "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.",

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T1 - Specific-heat of Na0.35CoO2 · 1.3H2O

T2 - Effects of sample age and pair breaking on two-gap superconductivity

AU - Phillips, N. E.

AU - Oeschler, N.

AU - Fisher, R. A.

AU - Gordon, J. E.

AU - Foo, M. L.

AU - Cava, R. J.

PY - 2007/9/1

Y1 - 2007/9/1

N2 - 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.

AB - 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.

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KW - Pair breaking

KW - Sample-dependent

KW - Superconductivity

KW - Two-gap

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