Vortex order-disorder transition in relaxation and field-sweep measurements
Abstract
Time evolution of the induction profile across a Bi 2Sr 2CaCu 2O 8+ δ crystal was magneto-optically recorded in two experiments: during ramping the external magnetic field or after a sudden application of the field. The results of these experiments reveal a front-like propagation or retreat of a transient disordered vortex state, respectively. Analysis of the front velocity shows that while the retreat is continuously decelerated, the propagation is accelerated, approaching a constant velocity when the front induction reaches the vortex order-disorder phase transition field Bod. The latter observation suggests a method for determining the value of Bod, eliminating transient state effects.
- Publication:
-
Physica C Superconductivity
- Pub Date:
- August 2004
- DOI:
- 10.1016/j.physc.2004.02.121
- Bibcode:
- 2004PhyC..408..382K
- Keywords:
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- Vortex phase transitions;
- Transient vortex state;
- Annealing time