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Reentrance of macroscopic quantum tunneling in cuprate superconductors

Jens Michelsen (Institutionen för mikroteknologi och nanovetenskap, Tillämpad kvantfysik) ; Vitaly Shumeiko (Institutionen för mikroteknologi och nanovetenskap, Tillämpad kvantfysik)
Advances in Science and Technology Vol. 75 (2010), p. 155.
[Konferensbidrag, refereegranskat]

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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Denna post skapades 2010-10-27. Senast ändrad 2010-12-28.
CPL Pubid: 128247


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