A study of path dependent effects in single crystals of (Formula presented) and (Formula presented) shows that critical current density (Formula presented) of the vortex state depends on its thermomagnetic history over a very large part of (Formula presented) parameter space. The path dependence in (Formula presented) is absent above the peak position (i.e., (Formula presented) of the peak effect region, which we believe identifies the complete loss of order in the vortex structure. The highly disordered field cooled (FC) state can be healed into a relatively ordered vortex lattice by subjecting it to a large enough change in dc field (few tens of Oe) or by shaking the field cooled state with sufficient ac field (few Oe).
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - Jan 1 1998|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics