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

Abstract

We investigate the current transfer in strongly-coupled oriented superconductors of the MgB2 type and related system by Monte Carlo simulation. Taking into account the grain boundary effects on the critical current density J G c 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 Jc 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.