Collective dynamics of a highly dilute vortex lattice in YBa2Cu3O7δ thin films

Johan J. Åkerman and K. V. Rao
Phys. Rev. B 65, 134525 – Published 29 March 2002
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Abstract

The dynamics of highly dilute vortex ensembles in YBa2Cu3O7δ thin films is investigated by low-field (5–90 Oe) ac susceptibility measurements of the dynamical relaxation rate Q. In a film with relatively weak pinning, flux bundling is found to be effective at all temperatures and down to the lowest fields. In a film with stronger pinning, single-vortex creep dominates only for T<20K, and small bundle creep is fully developed for T>40K. The behavior of highly separated vortices is hence surprisingly collective in YBa2Cu3O7δ. Quantum creep is observed below 11 K, and at about 60 K the elastic vortex description breaks down as the importance of plastic creep gradually increases.

  • Received 13 August 2001

DOI:https://doi.org/10.1103/PhysRevB.65.134525

©2002 American Physical Society

Authors & Affiliations

Johan J. Åkerman* and K. V. Rao

  • Department of Materials Science-Tmfy-MSE, Royal Institute of Technology, S-100 44 Stockholm, Sweden

  • *Present address: Motorola Labs, 7700 S, River Parkway ML34, Tempe, Arizona 85284. Email address: Johan.Akerman @motorola.com

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Vol. 65, Iss. 13 — 1 April 2002

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