Specific heat study of the Na0.3CoO2 · 1.3H2O superconductor

Influence of the complex chemistry

B. G. Ueland, P. Schiffer, Raymond Edward Schaak, M. L. Foo, V. L. Miller, R. J. Cava

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

We report results of specific heat measurements on polycrystalline samples of the layered superconductor, Na0.3CoO2 · 1.3H2O. The electronic contribution to the specific heat, γ, is found to be 12.2 mJ/mol K2. The feature at the superconducting transition is rather sharp, becoming broad and strongly suppressed in an applied magnetic field. The data indicate a residual normal state electronic specific heat at low temperatures, implying that there is a sizable population of normal state electrons in the samples even below Tc. Inhomogeneity in the Na content, to which the superconducting state is exquisitely sensitive, appears to be the most likely explanation for these results. These results further indicate that special sample handling is required for an accurate characterization of the superconducting state in this material.

Original languageEnglish (US)
Pages (from-to)27-30
Number of pages4
JournalPhysica C: Superconductivity and its applications
Volume402
Issue number1-2
DOIs
StatePublished - Feb 1 2004

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Superconducting materials
Specific heat
specific heat
chemistry
Thermal variables measurement
Electronic states
electron states
electronics
Electron energy levels
inhomogeneity
heat measurement
Magnetic fields
magnetic fields
Temperature

All Science Journal Classification (ASJC) codes

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

Cite this

Ueland, B. G. ; Schiffer, P. ; Schaak, Raymond Edward ; Foo, M. L. ; Miller, V. L. ; Cava, R. J. / Specific heat study of the Na0.3CoO2 · 1.3H2O superconductor : Influence of the complex chemistry. In: Physica C: Superconductivity and its applications. 2004 ; Vol. 402, No. 1-2. pp. 27-30.
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Specific heat study of the Na0.3CoO2 · 1.3H2O superconductor : Influence of the complex chemistry. / Ueland, B. G.; Schiffer, P.; Schaak, Raymond Edward; Foo, M. L.; Miller, V. L.; Cava, R. J.

In: Physica C: Superconductivity and its applications, Vol. 402, No. 1-2, 01.02.2004, p. 27-30.

Research output: Contribution to journalArticle

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T1 - Specific heat study of the Na0.3CoO2 · 1.3H2O superconductor

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AU - Ueland, B. G.

AU - Schiffer, P.

AU - Schaak, Raymond Edward

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AU - Miller, V. L.

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AB - We report results of specific heat measurements on polycrystalline samples of the layered superconductor, Na0.3CoO2 · 1.3H2O. The electronic contribution to the specific heat, γ, is found to be 12.2 mJ/mol K2. The feature at the superconducting transition is rather sharp, becoming broad and strongly suppressed in an applied magnetic field. The data indicate a residual normal state electronic specific heat at low temperatures, implying that there is a sizable population of normal state electrons in the samples even below Tc. Inhomogeneity in the Na content, to which the superconducting state is exquisitely sensitive, appears to be the most likely explanation for these results. These results further indicate that special sample handling is required for an accurate characterization of the superconducting state in this material.

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