Physics – Condensed Matter – Superconductivity
Scientific paper
2009-11-20
Superconductor Science and Technology 23 (2010) 025023
Physics
Condensed Matter
Superconductivity
23 pages, IOP style, 18 figures included
Scientific paper
10.1088/0953-2048/23/2/025023
We investigate driven magnetic flux lines in layered type-II superconductors subject to various configurations of strong point or columnar pinning centers by means of a three-dimensional elastic line model and Metropolis Monte Carlo simulations. We characterize the resulting nonequilibrium steady states by means of the force-velocity / current-voltage curve, static structure factor, mean vortex radius of gyration, number of double-kink and half-loop excitations, and velocity / voltage noise spectrum. We compare the results for the above observables for randomly distributed point and columnar defects, and demonstrate that the three-dimensional flux line structures and their fluctuations lead to a remarkable variety of complex phenomena in the steady-state transport properties of bulk superconductors.
Bullard Thomas J.
Klongcheongsan T.
T"auber Uwe C.
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