Abstract
The dynamics of highly dilute vortex ensembles in YBa 2 Cu 3 O 7 - 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 40 K. The behavior of highly separated vortices is hence surprisingly collective in YBa 2 Cu 3 O 7 - Φ . 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.
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