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Author (up) Civale, L.; Pasquini, G.; Levy, P.; Nieva, G.; Casa, D.; Lanza, H. openurl 
  Title Time relaxation of persistent currents in YBa2Cu3O7−x crystals with columnar defects Type Journal Article
  Year 1996 Publication Physica C: Superconductivity Abbreviated Journal Physica C  
  Volume 263 Issue 1-4 Pages 389-395  
  Abstract We have measured the persistent currents and their time relaxation in YBa2Cu3O7−x single crystals with correlated disorder introduced by irradiation with high-energy heavy-ions. For vortex density lower than the defect density, and for applied fields either parallel or nonparallel to the columnar defects, we find clear evidence of a pinning-crossover between a regime of strong individual pinning at low temperatures and a regime of weaker collective pinning at high temperatures. We explore the vortex dynamics above and below this crossover.  
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  Call Number BT @ gnieva @ Serial 455  
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