Journal of Siberian Federal University. Mathematics & Physics / Fractal Boundaries of Vortex Pinning Clusters in Copper-oxide Superconductors in Magnetic Field

Full text (.pdf)
Issue
Journal of Siberian Federal University. Mathematics & Physics. 2017 10 (2)
Authors
Vasyutin, Mikhael A.; Kuzmichev, Nikolay D.; Shilkin, Dmitri A.
Contact information
Vasyutin, Mikhael A.: Sub-Department of General Scientific Disciplines Mordovian Ogarev State University, Bolshevistskaya, 68 Saransk, 430005 Russia; ; Kuzmichev, Nikolay D.: Sub-Department of General Scientific Disciplines Mordovian Ogarev State University, Bolshevistskaya, 68 Saransk, 430005 Russia; Shilkin, Dmitri A.: Sub-Department of General Scientific Disciplines Mordovian Ogarev State University, Bolshevistskaya, 68 Saransk, 430005 Russia
Keywords
superconductivity; normal phase clusters; fractal boundaries; flux creep
Abstract

The influence of fractal boundaries of a normal phase clusters on the flux creep in the copper-oxide high- temperature superconductors YBCO was investigated. A model of the magnetic-field dependence of the voltage due to flux creep for different transport currents was developed. To describe the experimental curves is proposed to use an exponential-hyperbolic function in which the argument is direct current. Empirical dependence of the fractal dimension of the cluster boundaries on the magnetic field strength was determined. The characteristic values of the magnetic field were found. The index of connectivity of the flux creep paths at the percolation threshold was calculated

Pages
261–265
Paper at repository of SibFU
https://elib.sfu-kras.ru/handle/2311/32140