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Flux pinning model and pinning pressure in superconductors with randomly distributed columnar defects
Author(s) -
Zablotskii V.,
Polyakova T.
Publication year - 2003
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200301690
Subject(s) - condensed matter physics , vortex , pinning force , flux pinning , superconductivity , shearing (physics) , type ii superconductor , zener pinning , magnetic flux , magnetic field , vorticity , lattice (music) , materials science , physics , high temperature superconductivity , mechanics , critical current , thermodynamics , quantum mechanics , acoustics
We propose a new phenomenological model of flux pinning in type‐II superconductors with randomly distributed columnar defects. In a two‐dimensional vortex lattice three energies associated with (i) vortex‐vortex interaction, (ii) pin‐vortex interaction, and (iii) thermal fluctuations are taken into account. By free energy minimization we determine the equilibrium number of vortices pinned by a random pinning disorder, the associated pinning pressure, and the critical current density as a function of magnetic field, temperature and concentration of pins. A corporate action of pinning and shearing pressures can lead to appearance of the peak effect if the former is lower than the latter.