Fluctuation Effects in Mixed State of Type II Superconductor. Comparison of Experimental Results with Theoretical Predictions

Details Fluctuation Effects in Mixed State of Type II Superconductor. Comparison of Experimental Results with Theoretical Predictions Fluctuation Effects in Mixed State of Type II Superconductor. Comparison of Experimental Results with Theoretical Predictions

2002-02-13

arxiv.org/abs/cond-mat/0202221v1

NATO ASI Series, Fluctuation Phenomena in High Temperature Superconductors. Ed. by M.Ausloos and A.A.Varlamov, Kluwer Academic

Physics

Condensed Matter

Superconductivity

11 pages, 1 figure, Talk presented at the NATO Advanced Research Workshop on Fluctuation Phenomena in High Temperature Superco

Scientific paper

Results of the investigation of fluctuation phenomena in bulk type-II superconductors obtained in 1980 - 1984 years are compared with the analogous results obtained at the investigation of high-Tc superconductors (HTSC). It is shown the latter repeat in the main the results obtained before the HTSC discovery. It was discovered in 1981 year that a sharp change of resistive properties is observed below the second critical field, at H_{c4} < H_{c2}, in high quality samples of type-II superconductors. The same was repeated at investigation of high quality HTSC samples and was interpreted as vortex lattice melting. The difference of the (H_{c2} - H_{c4}) values for low- and high-Tc superconductors corresponds with the scaling law obtained in the lowest Landau level approximation. The linear approximation region above H_{c2}, the critical region and the Abrikosov state are considered. It is emphasized that the rigorous Ami-Maki theory should be used for description of paraconductivity in HTSC and "dirty" conventional superconductors. The approximation dependencies obtained from popular Aslamasov-Larkin, Hikami-Larkin and Lawrence-Doniac works do not have a validity region in these superconductors with wide critical region.

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