Quantum coherence and phase transitions in granular superconductors with dissipation. I. Ordered arrays
- P. N. Lebedev Physical Institute of the USSR, Moscow (USSR)
The authors investigate the effect of dissipative currents on a superconducting phase transition in two- and three-dimensional granular arrays. They find the corresponding phase diagrams and show that, depending on dissipation, both long-range and local quantum fluctuations may be effective in destroying the global phase coherence. For large values of charging-to-Josephson coupling energy ratio and at T = 0, they find the universal critical resistance R{sub c} only for three dimensional arrays while for two dimensional ones R{sub c}{sup {minus}1} diverges logarithmically with increasing of the grain charging energy. For large values of a Josephson coupling energy, quantum phase slip effects play the main role and lead to the universal critical resistance in both cases. They also investigate the effect of dissipation on the critical temperature of the XY model phase transition and show that strong dissipation is extremely effective in suppressing quantum effects.
- OSTI ID:
- 7243103
- Journal Information:
- Journal of Low Temperature Physics; (USA), Journal Name: Journal of Low Temperature Physics; (USA) Vol. 75:5-6; ISSN 0022-2291; ISSN JLTPA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
COHERENCE LENGTH
DIAGRAMS
DIMENSIONS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ENERGY LOSSES
FLUCTUATIONS
GINZBURG-LANDAU THEORY
GRANULAR MATERIALS
JOSEPHSON EFFECT
JOSEPHSON JUNCTIONS
JUNCTIONS
LENGTH
LOSSES
MATERIALS
MATHEMATICAL MODELS
MEAN-FIELD THEORY
MECHANICS
ORDER PARAMETERS
ORDER-DISORDER TRANSFORMATIONS
PHASE DIAGRAMS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
QUANTUM MECHANICS
SUPERCONDUCTING JUNCTIONS
SUPERCONDUCTIVITY
SUPERCONDUCTORS
THREE-DIMENSIONAL CALCULATIONS
TUNNEL EFFECT
TWO-DIMENSIONAL CALCULATIONS
VARIATIONS