Volume 44, Number 1, October I 1998
|Page(s)||91 - 97|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|Published online||01 September 2002|
Re-entrant peak effect in an anisotropic superconductor : Role of disorder
Tata Institute of Fundamental Research - Mumbai-400005, India
2 NEC Research Institute - 4 Independence Way, Princeton, New Jersey 08540, USA
3 TPPED, Bhabha Atomic Research Center - Mumbai-400085, India
4 Department of Physics, University of Warwick - Coventry, CV4 7AL, UK
Accepted: 30 July 1998
The influence of disorder (induced by pinning centres) on the peak effect (PE) phenomenon, namely, an anomalous increase in Jc vs. H (or T), has been studied in the anisotropic superconductor 2H-. Results from new electrical transport as well as dc and ac magnetic response studies are presented to demonstrate that increasing disorder shrinks the (H, T) parameter space over which the vortex lattice retains spatial order. We find that the re-entrant nature of PE is clearly manifested only in crystals which have moderate amount of disorder. We also find that the upper branch of the PE curve is fairly robust, whereas the lower re-entrant branch is strongly affected by disorder.
PACS: 74.60.-w – Type-II superconductivity / 74.25.Dw – Superconductivity phase diagrams / 64.70.Dv – Solid-liquid transitions
© EDP Sciences, 1998
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