Volume 82, Number 4, May 2008
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||07 May 2008|
Two-step depinning and re-entrant behavior of three-dimensional flux line lattices
Department of Physics, Southeast University - Nanjing 210096, China
Corresponding author: email@example.com
Accepted: 27 March 2008
We develop a three-dimensional flux line lattice (FLL) model with magnetic interactions between intraplane and interplane vortices to simulate the dynamic behavior of the flux flow in a disordered point-pinned system. A double-peak structure is found in the differential resistivity as a function of the driving current, corresponding to the two-step depinning behavior of the vortex motion. In between the two peaks there exists a new re-entrant pinning phase. The calculated results are summarized as a phase diagram of the interplane coupling strength of pancake vortices vs. the applied driving current. A huge peak effect and current-induced re-entrant pinning behavior appear in a narrow regime, where an unusual intrinsic pinning mechanism due to interlayer interactions dominates the peak effect. The phase diagram obtained is favorable for understanding the two-step depinning and re-entrant behavior observed recently experimentally.
PACS: 74.25.Qt – Vortex lattices, flux pinning, flux creep / 74.25.Op – Mixed states, critical fields, and surface sheaths / 74.25.Dw – Superconductivity phase diagrams
© EPLA, 2008
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