Paper Title:
Reentrance of Macroscopic Quantum Tunneling in Cuprate Superconductors
  Abstract

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.

  Info
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, 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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Price
$32.00
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