Theory of Percolative Conduction in Polycrystaline High-temperature Superconductors

Details Theory of Percolative Conduction in Polycrystaline High-temperature Superconductors Theory of Percolative Conduction in Polycrystaline High-temperature Superconductors

1998-11-17

arxiv.org/abs/cond-mat/9811255v3

Physics

Condensed Matter

Superconductivity

13 eps figures. style and order of presentation changed considerably

Scientific paper

Conduction in bulk polycrystalline high-T$_c$ superconductors with relatively high critical currents has been shown to be percolative. This phenomenon is due to weak links at grain boundaries. These weak links are the major limiting factor for technological applications which require high current densities. We formulate a model of these materials which can be reduced to a nonlinear resistor network. The model is solved by analytical approximations and a new numerical technique. The numerical technique is variational, which makes it capable of solving a wide variety of nonlinear problems. The results show that an unambiguous connection can be made between the I-V characteristics at the microscopic level and the macroscopic electrical properties.

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