Effects of geometrical fluctuations on the transition temperature of disordered quasi-one-dimensional superconductors

Details Effects of geometrical fluctuations on the transition temperature of disordered quasi-one-dimensional superconductors Effects of geometrical fluctuations on the transition temperature of disordered quasi-one-dimensional superconductors

2007-12-20

arxiv.org/abs/0712.3357v2

Phys. Rev. B 79, 014509 (2009)

Physics

Condensed Matter

Superconductivity

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Scientific paper

We study the superconducting transition temperature, T_c, of an array of fluctuating, maximally gapped interacting ladders, embedded in a disordered plane. Renormalization group analysis indicates that geometrical fluctuations mitigate the suppression of the intra-ladder pairing correlations by the disorder. In addition, the fluctuations enhance the Josephson tunneling between the ladders. Both effects lead to an increase of T_c in the Josephson coupled array. These findings may be relevant to the understanding of the 1/8 anomaly in the lanthanum based high-temperature superconductors.

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