Phase-coherence transition in granular superconductors with $\pi$ junctions
Abstract
We study the three-dimensional XY-spin glass as a model for the resistive behavior of granular superconductors containing a random distribution of junctions, as in high- superconducting materials with d-wave symmetry. The junctions leads to quenched in circulating currents (chiralities) and to a chiral-glass state at low temperatures, even in the absence of an external magnetic field. Dynamical simulations in the phase representation are used to determine the nonlinear current-voltage characteristics as a function of temperature. Based on dynamic scaling analysis, we find a phase-coherence transition at finite temperature below which the linear resistivity should vanish and determine the corresponding critical exponents. The results suggest that the phase and chiralities may order simultaneously for decreasing temperatures into a superconducting chiral-glass state.
Cite
@article{arxiv.cond-mat/0012238,
title = {Phase-coherence transition in granular superconductors with $\pi$ junctions},
author = {Enzo Granato},
journal= {arXiv preprint arXiv:cond-mat/0012238},
year = {2009}
}
Comments
5 pages, 1 figure, Proc. of ICM 2000, to appear in J. Magn. Magn. Mater