Manifestation of history dependent critical currents via dc and ac magnetisation measurements in single crystals of CeRu2 and 2H-NbSe2

Details Manifestation of history dependent critical currents via dc and ac magnetisation measurements in single crystals of CeRu2 and 2H-NbSe2 Manifestation of history dependent critical currents via dc and ac magnetisation measurements in single crystals of CeRu2 and 2H-NbSe2

1998-01-23

arxiv.org/abs/cond-mat/9801247v1

Physics

Condensed Matter

Superconductivity

4 pages of text (latex), 4 figures. Submitted to Physical Review B

Scientific paper

A study of path dependent effects in single crystals of CeRu2 and 2H-NbSe2 show that critical current density Jc of the vortex state depends on its thermomagnetic history over a very large part of (H,T) parameter space. The path dependence in Jc is absent above the peak position (i.e., H > Hp) of the peak effect region, which we believe identifies the complete loss of order in the vortex structure. The highly disordered 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 FC state with sufficient ac field (few Oe).

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