Europhys. Lett.
Volume 67, Number 4, August 2004
Page(s) 648 - 654
Section Condensed matter: electronic structure, electrical, magnetic, and optical properties
Published online 01 August 2004
Europhys. Lett., 67 (4), pp. 648-654 (2004)
DOI: 10.1209/epl/i2003-10303-0

Grain boundary effects on transport properties in strongly coupled superconductors: A Monte Carlo study

L. V. Belevtsov1, 2 and V. N. Pervukhin2

1  Donetsk Physics and Technology Institute NAS of Ukraine 72 R. Luxemburg Street, 83114 Donetsk, Ukraine
2  Department of Applied Mathematics, Donbass Engineering Academy 84313 Kramatorsk, Ukraine

(Received 20 August 2003; accepted in final form 8 June 2004)

We investigate the current transfer in strongly-coupled oriented superconductors of the $\chem{MgB_{2}}$ type and related system by Monte Carlo simulation. Taking into account the grain boundary effects on the critical current density $J_{\ab{c}}^{\ab{G}}$ in a separate grain (L. V. Belevtsov, Europhys. Lett. 59 (2002) 768) we extend our study to the bulk characteristics of transport. The motivation for this work was to investigate the dependence of bulk $J_{\ab{c}}$ on magnetic field, grain-coupling strength, normalized grain size and mass anisotropy. We have found the strong correlation between the grain and massive transport properties.

74.25.Qt - Vortex lattices, flux pining, flux creep.
74.25.Sv - Critical currents.

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