Critical Fluctuations in the Microwave Complex Conductivity of BSCCO and YBCO Thin Films

Details Critical Fluctuations in the Microwave Complex Conductivity of BSCCO and YBCO Thin Films Critical Fluctuations in the Microwave Complex Conductivity of BSCCO and YBCO Thin Films

2002-09-06

arxiv.org/abs/cond-mat/0209176v2

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures

Scientific paper

Critical fluctuations above $T_c$ are studied in the microwave complex conductivity of BSCCO-2212, BSCCO-2223, and YBCO thin films. The analysis of the experimental data yields the temperature dependences of the reduced coherence length $\xi(T)/\xi_0$. Two critical regimes are observed, having the static critical exponent $\nu=1$ close to $T_c$, and a crosover to $\nu=2/3$ at higher temperatures. In more anisotropic superconductors the reduced coherence lengths are larger, and the critical states extend to higher temperatures.

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