Berezinskii-Kosterlitz-Thouless transition and fluctuation paraconductivity in Y1Ba2Cu3O7 single crystal films

✍ Scribed by V.A. Gasparov

• Publisher: Elsevier Science
• Year: 1991
• Tongue: English
• Weight: 568 KB
• Volume: 178
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(91)90097-i

✦ Synopsis

The superconducting transition of the YBa2Cu307 single-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 2-t (T) and a peak in the RF losses observed at TeKT = 85.1 K, together with an exponential square-root temperature dependence of the resistivity p(T) tail below To, are explained by the Berezinskii-Kosterlitz-Thouless transition within the CuO2 double planes. Good agreement with Lawrence-Doniach quasi-2D fluctuation paraconductivity theory was obtained for p(T) above T¢, with a perpendicular component of the coherence length ~± = 1.5 + 0.5 A and a CuO2 interlayer distance 6.4 + 1 A.