Reentrance of Macroscopic Quantum Tunneling in Cuprate Superconductors

Abstract:

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We present a theoretical analysis of the transition from thermal activation (TA) regime to the macroscopic quantum tunneling (MQT) regime of the decay from a metastable persistent current state in grain boundary junctions of cuprate superconductors. This transition is conventionally characterized by a single crossover temperature determined by the potential profile and dissipative mechanisms. It is shown that due to the existence of low energy bound states (mid-gap states) for various relative orientations of the crystal axes, there exists a window of parameters where one finds, with lowering temperature, an inverse crossover from MQT to TA, followed by a subsequent reentrance of MQT. It is shown that these predictions are in reasonable agreement with recent experiments.

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Periodical:

Edited by:

Pietro VINCENZINI, David S. GINLEY, Giovanni BRUNO, Attilio RIGAMONTI and Nikolay ZHELUDEV

Pages:

155-160

DOI:

10.4028/www.scientific.net/AST.75.155

Citation:

J. Michelsen and V. S. Shumeiko, "Reentrance of Macroscopic Quantum Tunneling in Cuprate Superconductors", Advances in Science and Technology, Vol. 75, pp. 155-160, 2010

Online since:

October 2010

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$35.00

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