Anisotropic renormalized fluctuations in the microwave resistivity in YBCO

Details Anisotropic renormalized fluctuations in the microwave resistivity in YBCO Anisotropic renormalized fluctuations in the microwave resistivity in YBCO

1998-10-15

arxiv.org/abs/cond-mat/9810183v1

Physics

Condensed Matter

Superconductivity

RevTex, 8 pages with 5 figures included, to be published in Physical Review B

Scientific paper

10.1103/PhysRevB.58.14581

We discuss the excess conductivity above Tc due to renormalized order-parameter fluctuations in YBCO at microwave frequencies. We calculate the effects of the uniaxial anisotropy on the renormalized fluctuations in the Hartree approximation, extending the isotropic theory developed by Dorsey [Phys. Rev. B 43, 7575 (1991)]. Measurements of the real part of the microwave resistivity at 24 and 48 GHz and of the dc resistivity are performed on different YBCO films. The onset of the superconducting transition and the deviation from the linear temperature behavior above Tc can be fully accounted for by the extended theory. According to the theoretical calculation here presented, a departure from gaussian toward renormalized fluctuations is observed. Very consistent values of the fundamental parameters (critical temperature, coherence lenghts, penetration depth) of the superconducting state are obtained.

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