2002/08/17 by E. Silva, R. Marcon, Silva, E. +7
Physics and Astronomy · #FOS: Physical sciences #Superconductivity (cond-mat.supr-con) #cond-mat.supr-con
paper · pdf · doi:10.48550/arxiv.cond-mat/0208342
RevTeX, 4 pages, 2 figures. To appear in J. Low Temp. Phys. (Proceedings of MOS 02 Conference, Hsinchu, Taiwan, 13-17/8/2002)
arxiv created 2002/08/17 · arxiv updated 2009/11/30
We present measurements of the fluctuational excess conductivity at 48 GHz and 24 GHz in YBa2Cu3O7-δ films above the transition temperature. The measurements depart from the gaussian prediction for finite-frequency fluctuational conductivity. We focus on the region not too close to Tc, where the real part of the excess conductivity drops much faster than the prediction of the gaussian model. We calculate the dynamic excess conductivity within a Ginzburg-Landau approach. In the calculation we insert a short-wavelength cutoff of the order of the inverse coherence length, in order to suppress high-momentum modes. The excess conductivity of all samples measured can be described very well by the modified model.