Negative local superfluid densities: The difference between dirty superconductors and dirty Bose liquids

Journal Article · Fri Feb 01 04:00:00 EST 1991 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.43.3740· OSTI ID:5904664

Spivak, B I; Kivelson, S A ^[1]

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1. Department of Physics, The University of California at Los Angeles, Los Angeles, California 90024 (WS)

We show that in a distorted superconductor near the superconductor-to-insulator transition, the local superfluid density {ital N}{sub {ital s}} fluctuates from point to point in sign as well as magnitude. We demonstrate this explicitly with a simple model in which correlation effects produce a negative Josephson coupling between two superconducting grains. We argue more generally that both correlation effects and resistance fluctuations will produce random signs of {ital N}{sub {ital s}}. This implies that a disordered superconductor is more like a quantum {ital XY} spin glass than a disordered Bose liquid.

• OSTI ID: 5904664
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 43:4; ISSN 0163-1829; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

656100* -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BOSE-EINSTEIN CONDENSATION
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL STRUCTURE
ELECTRICAL EQUIPMENT
ELECTRICAL INSULATORS
ENERGY LEVELS
EQUIPMENT
GRAIN BOUNDARIES
GROUND STATES
JOSEPHSON EFFECT
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SPIN GLASS STATE
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
TUNNEL EFFECT