Critical disorder effects in Josephson-coupled quasi-one-dimensional superconductors

E. P. Nakhmedov; R. Oppermann

doi:10.1134/s0021364010110068

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arXiv · 0911.1253

Critical disorder effects in Josephson-coupled quasi-one-dimensional superconductors

E. P. Nakhmedov·R. Oppermann

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Abstract

Effects of non-magnetic randomness on the critical temperature T_c and diamagnetism are studied in a class of quasi-one dimensional superconductors. The energy of Josephson-coupling between wires is considered to be random, which is typical for dirty organic superconductors. We show that this randomness destroys phase coherence between the wires and T_c vanishes discontinuously when the randomness reaches a critical value. The parallel and transverse components of the penetration depth are found to diverge at different critical temperatures T_c^{(1)} and T_c, which correspond to pair-breaking and phase-coherence breaking. The interplay between disorder and quantum phase fluctuations results in quantum critical behavior at T=0, manifesting itself as a superconducting-normal metal phase transition of first-order at a critical disorder strength.

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E. P. Nakhmedov, R. Oppermann. 2009-11-06. Critical disorder effects in Josephson-coupled quasi-one-dimensional superconductors. https://doi.org/10.1134/s0021364010110068

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