caa a22 4500 445381183 CHVBK 20180317143017.0 cr unu---uuuuu 170323e20110101xx s 000 0 eng 10.1007/s10948-010-0907-5 doi (NATIONALLICENCE)springer-10.1007/s10948-010-0907-5 Miu L. National Institute of Materials Physics, 77125, Bucharest-Magurele, Romania aut Vortex Dynamics in YBa2Cu2O7− δ Films and Superlattices: AMagnetizationRelaxation Study [Elektronische Daten] [L. Miu] The relaxation of the irreversible magnetization of optimally doped YBa2Cu3O7−δ (YBCO) films and YBa2Cu3O7−δ /PrBa2Cu3O7−δ (YBCO/PrBCO) superlattices in a magnetic field H oriented along the c axis was investigated over a large temperature T interval. The observed behavior is dominated by the presence of a crossover elastic vortex creep at low T-plastic creep at high T generated by the T-dependent current density J of the macroscopic currents induced in the specimen during experiments. Magnetization relaxation in the flux-creep annealing regime indicates the reduction of the creep crossover temperature with decreasing J, which suggests that in static conditions the disordered vortex phase at high H behaves like a plastically pinned vortex assembly, rather than an elastic vortex glass. The often reported scaling of the electric field E-transport current density J characteristics in agreement with an elastic vortex glass-vortex fluid transition seems to originate from the creep crossover generated by an increasingJ. Springer Science+Business Media, LLC, 2010 YBCO films and superlattices nationallicence Magnetization relaxation nationallicence Vortex-creep activation energy nationallicence Creep crossover nationallicence Journal of Superconductivity and Novel Magnetism Springer US; http://www.springer-ny.com 24/1-2(2011-01-01), 121-125 1557-1939 24:1-2<121 2011 24 10948 https://doi.org/10.1007/s10948-010-0907-5 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10948-010-0907-5 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Miu L. National Institute of Materials Physics, 77125, Bucharest-Magurele, Romania aut NATIONALLICENCE 773 0- Journal of Superconductivity and Novel Magnetism Springer US; http://www.springer-ny.com 24/1-2(2011-01-01), 121-125 1557-1939 24:1-2<121 2011 24 10948 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer