Macroscopic quantum tunneling in high-$T_c$ superconductors: the role of collective charge oscillations

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We present a theoretical study of an escape rate for switching from the superconducting state to a resistive one in series arrays of strongly interacting Josephson junctions. At low temperatures such a switching is determined by macroscopic quantum tunneling (MQT) of a spatially extended Josephson phase. An increase of the crossover temperature from the thermal to quantum regimes, and a giant enhancement of MQT escape rate is obtained. Such an effect is explained by excitation of collective charge oscillations forming a {\it charge instanton}. Using a model of screened Coulomb interaction we found that our analysis is in a good accord with recently published experimental results on an enhancement of the MQT in single crystals of high-$T_c$ superconductors.
4 pages, 3 figures

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Superconductivity, Mesoscale and Nanoscale Physics

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http://salesiana.dossiersoluciones.com/handle/123456789/112258

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0606751
 http://arxiv.org/abs/cond-mat/0606751

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arXiv