Flux Flow Dynamics in Superconducting Films
Current-voltage characteristics (CVC) and their first-order derivatives have been measured for niobium and Pb-22% Bi alloy films in magnetic fields in the temperature range 0.2 to 0.5 Tc. CVC derivatives were found to have a peak that the authors attributed to the incoherent movement of flux lines in the weakly supercritical range due to their interaction with pins. Peak amplitude and position strongly depend on the magnetic field. This effect occurred for all magnetic fields higher than 0.2 Hc2, temperatures, and specimen orientations. A model of the distribution function of pins qualitively accounts for experimental data obtained. The theoretical description must be modified by taking into account the interaction between flux lines.
KeywordsVortex Helium Resis Sapphire
Unable to display preview. Download preview PDF.
- 2.R. G. Jones, E. H. Rhoderick, and A. C. Rose-Innes, Nonlinearity in the voltage-current characteristic of type-2 superconductor, Phys. Lett. 24A:318–319 (1967).Google Scholar
- 4.A. E. Larkin and Yu. N. Obchinikov, Nonlinear conductivity of superconductors in the compound state, Zh. Eksp. Teor. Fiz. 68:1915–1927 (1975).Google Scholar
- 5.B. Yu. Block and S. V. Lempitsky, Influence of magnetic fields on the resistive condition of wide superconducting films, Fiz. Tverd. Tela 26:457–461 (1984).Google Scholar
- 6.V. M. Pan, G. G. Kaminsky, V. G. Prokhorov, and V. F. Taborov, in: “Physical Methods of Studying Metals,” Scientific Council, Kiev (1981), pp. 36–41.Google Scholar
- 7.G. G. Kaminsky, V. G. Prokhorov, and K. G. Tretiatchenko, Peculiar resistivity features of niobium films in magnetic fields, in: “23rd All-Soviet Conference on Physics at Low Temperatures,” Academy of Sciences, ESSR, Tallin (1984), pp. 166–167.Google Scholar
- 8.A. P. Smirnov and N. F. Fedorov, Nature of the anomolous resistive condition in superconductors, Fiz. Tverd. Tela 13:796–798 (1971).Google Scholar