Percolating granular superconductors

Details Percolating granular superconductors Percolating granular superconductors

2002-11-11

arxiv.org/abs/cond-mat/0211216v1

Phys. Rev. E 67, 046115 (2003)

Physics

Condensed Matter

Statistical Mechanics

18 pages, 2 figures

Scientific paper

10.1103/PhysRevE.67.046115

We investigate diamagnetic fluctuations in percolating granular superconductors. Granular superconductors are known to have a rich phase diagram including normal, superconducting and spin glass phases. Focusing on the normal-superconducting and the normal-spin glass transition at low temperatures, we study he diamagnetic susceptibility $\chi^{(1)}$ and the mean square fluctuations of the total magnetic moment $\chi^{(2)}$ of large clusters. Our work is based on a random Josephson network model that we analyze with the powerful methods of renormalized field theory. We investigate the structural properties of the Feynman diagrams contributing to the renormalization of $\chi^{(1)}$ and $\chi^{(2)}$. This allows us to determine the critical behavior of $\chi^{(1)}$ and $\chi^{(2)}$ to arbitrary order in perturbation theory.

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