Berezinskii-Kosterlitz-Thouless transition and fluctuation paraconductivity in Y1Ba2Cu3O7single crystal films

  • Gasparov V
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The superconducting transition of the YBa2Cu3O7single-crystal films on (100) SrTiO3, measured by the radio-frequency sheet impedance method, is observed below the mean-field superconducting transition temperature Tc=89.1 K determined from quasi-2D fluctuation paraconductivity. A clear jump in the square of the inverse penetration depth λ-1(T) and a peak in the RF losses observed at TBKT=85.1 K, together with an exponential square-root temperature dependence of the resistivity ρ{variant}(T) tail below Tc, are explained by the Berezinskii-Kosterlitz-Thouless transition within the CuO2double planes. Good agreement with Lawrence-Doniach quasi-2D fluctuation paraconductivity theory was obtained for ρ{variant}(T) above Tc, with a perpendicular component of the coherence length ξ⊥=1.5±0.5 A ̊ and a CuO2interlayer distance 6.4±1 Å. © 1991.

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  • V. A. Gasparov

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