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Anisotropic fluctuation magnetoconductivity in Bi2Sr2Ca2Cu3Ox thin films

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Zeitschrift für Physik B Condensed Matter

Abstract

Measurements of the fluctuation magnetoconductivity as a function of both the magnetic field up to 13 T and the temperature in thin films of Bi2Sr2Ca2Cu3Ox are presented. The variation of the magnetoconductivity with the magnetic field strength is quadratic at temperatures distantly above the critical temperatureT c and changes to an entirely negative curvature nearT c . The latter behavior is attributed to an inhomogeneous critical temperature in the films. The results are analyzed in terms of recent theoretical models for fluctuation-enhanced magnetoconductivity in layered superconductors. The magnetoconductivity in a magnetic field oriented normal to the copper-oxide layers is dominated by the orbital contribution of the Aslamazov-Larkin effect. The magnetoconductivity in the parallel orientation is distinctly smaller and provides evidence for the corresponding Zeeman contribution. The latter measurement also indicates that the Maki-Thompson process may be insignificant in Bi2Sr2Ca2Cu3Ox.

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Lang, W. Anisotropic fluctuation magnetoconductivity in Bi2Sr2Ca2Cu3Ox thin films. Z. Physik B - Condensed Matter 97, 523–528 (1995). https://doi.org/10.1007/BF01322434

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  • DOI: https://doi.org/10.1007/BF01322434

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