Thermodynamics of two-dimensional josephson junctions

B. Horovitz, A. Golub, E. B. Sonin, A. D. Zaikin

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

We derive the effective free energy of a two-dimensional Josephson junction in the presence of an external current and predict that the junction has a phase transition at a temperature TJ below the bulk transition temperature Tc. In the range TJ < T < Tc long-range phase correlation exists in the bulk, but is destroyed in the vicinity of the junction. The critical current Ic is reduced by thermal fluctuations, for a junction of size L, Ic∼ Lb(T) where b(T) < 0 for TJ < T < Tc (i.e. Ic vanishes at L→∞) while 0 < b(T) < 2 for T < TJ. Our results may account for the absence of an observable supercurrent at temperatures below Tc in YBa2Cu3Ox- and Bi2Sr2CaCu2O8-based junctions.

Original languageEnglish
Pages (from-to)699-704
Number of pages6
JournalEPL
Volume25
Issue number9
DOIs
StatePublished - 20 Mar 1994

ASJC Scopus subject areas

  • General Physics and Astronomy

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