Thermodynamic fluctuations in the superconductor<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Y</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Ba</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Cu</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow><mml:mn>9</mml:mn><mml:mo>−</mml:mo><mml:mi>y</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>: Evidence for two-dimensional superconductivity
Marcel AusloosInstitut de Physique B5, Université de Liège, B-4000 Liège, BelgiumChristophe LaurentInstitut de Physique B5, Université de Liège, B-4000 Liège, Belgium
1988lv
ABI
Аннотация
The electrical resistance and the magnetoresistance of the ceramic superconductor ${\mathrm{Y}}_{1}{\mathrm{Ba}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{9\ensuremath{-}y}$ have been precisely measured in order to extract the temperature derivative and to analyze the fluctuation regimes. The logarithmic dependence at high temperature is followed near the transition by a two-dimensional fluctuation regime in agreement with Aslamazov-Larkin theory (critical exponent ${\ensuremath{\lambda}}_{2D}=1$, and a complex behavior below ${T}_{c}$. Our findings disprove the observation of a three-dimensional fluctuation regime near and above ${T}_{c}$.
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