Observation of a Field Induced Transition in the Vortex Solid of DyBa<sub>2</sub>Cu<sub>3</sub>O<sub>7</sub>/(Y<sub>1-x</sub>Pr<sub>x</sub>)Ba<sub>2</sub>Cu<sub>3</sub>O<sub>7</sub> Superlattices
- Obara, Haruhiko
- Andersson, Magnus Karl Johan
- Fàbrega, Lourdes
- Fivat, Patrice Claude
- Triscone, Jean-Marc
- Decroux, Michel André
- Fischer, Oystein
Publication date
January 1995
DOI Publisher
American Physical Society (APS)Abstract
We report on the observation of a change in the field dependence of the critical current density Jc of DyBa2Cu3O7/(Y0.45Pr0.55)Ba2Cu3O7 superlattices at a characteristic magnetic field H∗s. This change shows up as an abrupt transition when analyzing the current-voltage ( I−V) characteristics in the framework of the vortex glass and collective flux creep theories. This behavior can be traced back to a sudden reduction in the collective pinning energy Uc above H∗s, and may reflect a softening transition of the vortex lines in the vortex solid. H∗s is very similar to the characteristic field H∗l in the vortex liquid phase, which we interpreted to be due to entanglement
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