Quantum nucleation and thermal activation of vortex rings in high-Tc superconductors

H. Jiang*, A. Widom, Yonggang Huang, T. Yuan, C. Vittoria, D. B. Chrisey, J. S. Horwitz

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


Vortex-ring nucleation by thermal activation and quantum-tunneling processes in high-Tc superconductors is discussed. The nonlinear resistance scales as e1/2-(J/J)1/2. Thermal activation yields a critical index of 1/2=1, while quantum tunneling (without normal current dissipation) yields a critical index of 1/2=2. Current-voltage characteristics were measured on both disordered (low-Jc), ordered (c axis normal to the film plane, high-Jc) Y-Ba-Cu-O films, and microbridges below Tc. The data were examined in terms of both thermal-activation and quantum-nucleation models. For the disordered films, the 1/2=1 scaling law is in reasonable agreement with data, while 1/2=2 scaling is required to explain the results of the ordered films at low temperatures. For the microbridges, the 1/2=2 scaling extends even to high temperatures.

Original languageEnglish (US)
Pages (from-to)3048-3053
Number of pages6
JournalPhysical Review B
Issue number6
StatePublished - Jan 1 1992

ASJC Scopus subject areas

  • Condensed Matter Physics

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