Vortex lattice melting, pinning and kinetics
- Stanford Univ., CA (United States)
The phenomenology of the high T{sub c} superconductors is discussed both at the level of the thermodynamics of melting of the Abrikosov flux lattice and in terms of the melting and kinetics of the flux lattice for a pinned system. The authors review results on 3D melting obtained by a Monte Carlo simulation approach in which the 2D {open_quotes}pancake{close_quotes} vortices are treated as statistical variables. The authors discuss pinning in the context of the strong pinning regime in which the vortex density given in terms of the applied field B is small compared to that represented by an effective field B{sub pin} measuring the pinning center density. The authors introduce a new criterion for the unfreezing of a vortex glass on increase of magnetic field or temperature, in the strong pinning, small field unit. The authors model this limit in terms of a single flux line interacting with a columnar pin. This model is studied both analytically and by computer simulation. By applying a tilt potential, the authors study the kinetics of the vortex motion in an external current and show that the resulting current-voltage characteristic follows a basic vortex glass-like scaling relation in the vicinity of the depinning transition.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 102575
- Report Number(s):
- CONF-9309321-; ISSN 0022-2291; CNN: Grant DMR-9302882; Contract EPRI RP8009-24; TRN: 95:019723
- Journal Information:
- Journal of Low Temperature Physics, Vol. 95, Issue 1-2; Conference: International workshop on cuprate and heavy fermion superconductors, Cologne (Germany), 27-30 Sep 1993; Other Information: PBD: Apr 1994
- Country of Publication:
- United States
- Language:
- English
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