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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/16551

Title: Peak effect, plateau effect, and fishtail anomaly: The reentrant amorphization of vortex matter in 2H-NbSe2
Authors: BANERJEE, SS
RAMAKRISHNAN, S
GROVER, AK
RAVIKUMAR, G
MISHRA, PK
SAHNI, VC
TOMY, CV
BALAKRISHNAN, G
PAUL, DM
GAMMEL, PL
BISHOP, DJ
BUCHER, E
HIGGINS, MJ
BHATTACHARYA, S
Keywords: flux-line-lattice
anisotropic superconductor 2h-nbse2
high-temperature superconductors
ii superconductors
single-crystals
elastic theory
weak disorder
magnetization
yba2cu3o7-delta
transition
Issue Date: 2000
Publisher: AMERICAN PHYSICAL SOC
Citation: PHYSICAL REVIEW B, 62(17), 11838-11845
Abstract: The magnetic field dependence of the critical current is studied in single-crystal samples of the weak pinning type-II superconductor 2H-NbSe2 in the high-temperature and the low-field region of the (H,T) space. The experimental results demonstrate various pinning regimes: a collective pinned quasiordered solid in the intermediate-field range that is destabilized in favor of disordered vortex phases in both high fields near H-c2 and at low fields near H-c1. The temperature evolution of the pinning behavior demonstrates how the amorphous limit (where the correlation volume is nearly field independent) is approached around the so-called nose region of the reentrant peak-effect boundary. In the high-field regime the rapid approach to the amorphous limit naturally yields a peak effect, i.e., a peak in the critical current. In the low-field regime the crossover to the individual pinning regime gives rise to a "plateau effect." We show that with increasing effective pinning the peak effect shifts away from H-c2 and resembles a "fishtail" anomaly.
URI: http://dx.doi.org/10.1103/PhysRevB.62.11838
http://dspace.library.iitb.ac.in/xmlui/handle/10054/16551
http://hdl.handle.net/10054/16551
ISSN: 0163-1829
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