| Issue |
Europhys. Lett.
Volume 44, Number 1, October I 1998
|
|
|---|---|---|
| Page(s) | 91 - 97 | |
| Section | Condensed matter: electronic structure, electrical, magnetic and optical properties | |
| DOI | https://doi.org/10.1209/epl/i1998-00440-4 | |
| Published online | 01 September 2002 | |
Re-entrant peak effect in an anisotropic superconductor 
: Role of disorder
1
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
Received:
27
April
1998
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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