Abstract
The nonlinearity of the current-voltage characteristics for YBa2Cu3O7 − x single crystals is investigated in the vicinity of the superconducting transition temperature T c , and the mechanisms responsible for the nonlinearity of the current-voltage characteristics are considered. The current-voltage characteristics and the amplitudes of the higher voltage harmonics for the YBa2Cu3O7 − x single crystals are directly measured using modulation Fourier analysis. It is shown that the positions of the maxima in the amplitudes of the higher voltage harmonics coincide with the Berezinskii-Kosterlitz-Thouless transition temperature T BKT. This coincidence can provide a means for determining the transition temperature T BKT. A number of parameters characterizing the YBa2Cu3O7 − x single crystals in the superconducting state are estimated using the experimental results and the model of a Berezinskii-Kosterlitz-Thouless transition. The parameters thus estimated are in good agreement with the data available in the literature.
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Original Russian Text © M.A. Vasyutin, A.I. Golovashkin, N.D. Kuz’michev, 2006, published in Fizika Tverdogo Tela, 2006, Vol. 48, No. 12, pp. 2128–2135.
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Vasyutin, M.A., Golovashkin, A.I. & Kuz’michev, N.D. Nonlinearity of the current-voltage characteristics for YBa2Cu3O7–x single crystals and the Berezinskii-Kosterlitz-Thouless transition. Phys. Solid State 48, 2250–2259 (2006). https://doi.org/10.1134/S1063783406120031
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DOI: https://doi.org/10.1134/S1063783406120031