Flux flow, pinning, and resistive behavior in superconducting networks
We have studied the behavior of fluctuation effects in superconducting systems using numerical simulations of XY and Coulomb gas models. Flux flow resistance in two dimensional Josephson junction arrays has been calculated, and related to correlations in vortex structure. Randomness has been introduced, and its effects on the superconducting transition, and vortex mobility, have been studied. We find that randomness destroys phase coherence, yet the randomness induced pinning reduces flux flow resistance at low temperatures. Vortex line fluctuations in high temperature superconductors have been studied using a three dimensional XY model. We have considered the melting of the vortex line lattice, and the entanglement and cutting of vortex lines in the vortex line liquid phase. Vortex line entangling and cutting appear to occur on the same length scales in the liquid phase. The vortex structure function has been calculated and from it, elastic properties of the vortex line liquid have been inferred. The two dimensional classical Coulomb gas, where charges map onto vortices in the superconducting system, has been simulated. The melting transitions of ordered charge (vortex) lattices have been studied, and we find evidence that these transitions do not have the critical behavior expected from standard symmetry analysis.
- Research Organization:
- Rochester Univ., NY (United States). Dept. of Physics and Astronomy
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG02-89ER14017
- OSTI ID:
- 6048147
- Report Number(s):
- DOE/ER/14017-3; ON: DE92004064
- Country of Publication:
- United States
- Language:
- English
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Flux flow, pinning, and resistive behavior in superconducting networks
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Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
HIGH-TC SUPERCONDUCTORS
MAGNETIC FLUX
JOSEPHSON JUNCTIONS
COMPUTERIZED SIMULATION
ELECTRIC CONDUCTIVITY
FLUCTUATIONS
PHASE TRANSFORMATIONS
PROGRESS REPORT
RANDOMNESS
VORTEX FLOW
DOCUMENT TYPES
ELECTRICAL PROPERTIES
FLUID FLOW
JUNCTIONS
PHYSICAL PROPERTIES
SIMULATION
SUPERCONDUCTING JUNCTIONS
SUPERCONDUCTORS
VARIATIONS
665411* - Basic Superconductivity Studies- (1992-)