Microwave fluctuational conductivity in YBa$_{2}$Cu$_{3}$O$_{7-δ}$

Details Microwave fluctuational conductivity in YBa$_{2}$Cu$_{3}$O$_{7-δ}$ Microwave fluctuational conductivity in YBa$_{2}$Cu$_{3}$O$_{7-δ}$

2002-08-17

arxiv.org/abs/cond-mat/0208343v2

Physics

Condensed Matter

Superconductivity

RevTeX, 12 printed pages with 5 figures, revised version of cond-mat/0208343, to be published in European Physical Journal B

Scientific paper

10.1140/epjb/e2004-00057-5

We present measurements of the microwave complex conductivity at 23.9 and 48.2 GHz in YBa$_{2}$Cu$_{3}$O$_{7-\delta}$ films, in the fluctuational region above $T_{c}$. With increasing temperature, the fluctuational excess conductivity drops much faster than the well-known calculations within the time-dependent Ginzburg-Landau theory [H. Schmidt {\em Z. Phys.} {\bf 216}, 336]. Approaching the transition temperature, slowing down of the fluctuations is observed. We discuss the results in terms of a modified gaussian theory for finite-frequency fluctuational conductivity, where renormalization is introduced in order to account for the $T\to T_{c}$ regime, and a spectral cutoff is inserted in order to discard high-momentum modes. The data are in excellent agreement with the modified theory, when formulated for three-dimensional, anisotropic superconductors, in the whole experimentally accessible temperature range, and for both frequencies.

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