Flux-line lattice in high-T[sub c] superconductors
- Max-Planck-Institut fuer Metallforschung, Stuttgart (Germany)
The flux-line lattice in type-II superconductors has unusual nonlocal elastic properties which make it soft for short wavelengths of distortion. This softening is particularly pronounced in the highly anisotropic high-T[sub c] superconductors (HTSC) where it leads to large thermal fluctuations and to thermally activated depinning of the Abrikosov vortices. Numerous transitions are predicted for these layered HTSC when the temperature T, magnetic induction B, or current density J are changed. In particular, the flux lines are now chains of two-dimensional (2D) [open quotes]pancake vortices[close quotes] which may [open quotes]evaporate[close quotes] by thermal fluctuations or may depin individually. At sufficiently high T, ohmic resistivity p(T,B) is observed down to J [yields] 0. This indicates that the flux lines are in a [open quotes]liquid state[close quotes] with no shear stiffness and with small depinning energy or that the 2D vortices can move independently. At lower T, p(T, B, J) is nonlinear since the pinning energy of an elastic vortex lattice or [open quotes]vortex glass[close quotes] increases with decreasing J as predicted by theories of collective pinning and by [open quotes]vortex glass[close quotes] scaling. 160 refs., 7 figs.
- OSTI ID:
- 5552014
- Journal Information:
- Journal of Superconductivity; (United States), Journal Name: Journal of Superconductivity; (United States) Vol. 6:4; ISSN JOUSEH; ISSN 0896-1107
- Country of Publication:
- United States
- Language:
- English
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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANISOTROPY
CREEP
HIGH-TC SUPERCONDUCTORS
MAGNETIC FLUX
MAGNETIC PROPERTIES
MATHEMATICAL MODELS
MECHANICAL PROPERTIES
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
SUPERCONDUCTORS
TYPE-II SUPERCONDUCTORS