Berezinskii-Kosterlitz-Thouless transition in a spin-charge-separated superconductor

Journal Article · Fri Apr 01 00:00:00 EST 1994 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.49.9831· OSTI ID:5000442

Rodriguez, J P ^[1]

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1. Department of Physics and Astronomy, California State University, Los Angeles, California 90032 (United States)

A model for spin-charge-separated superconductivity in two dimensions is introduced where the phases of the spinon and holon order parameters couple guage invariantly to a statistical gauge field representing chiral spin fluctuations. The model is analyzed in the continuum limit and in the low-temperature limit. In both cases we find that physical electronic phase correlations show a superconducting-normal phase transition of the Berezinskii-Kosterlitz-Thouless type, while statistical gauge-field excitations are found to be strictly gapless. It is argued that the former transition is in the same universality class as that of the [ital XY] model. We thus predict a universal jump in the superfluid density at this transition. The normal-to-superconductor phase boundary for this model is also obtained as a function of carrier density, where we find that its shape compares favorably with that of the experimentally observed phase diagram for the oxide superconductors.

• OSTI ID: 5000442
• Journal Information: Physical Review, B: Condensed Matter; (United States), Vol. 49:14; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
SUPERCONDUCTORS
KOSTERLITZ-THOULESS THEORY
CHIRAL SYMMETRY
CUPRATES
GAUGE INVARIANCE
ORDER PARAMETERS
PHASE DIAGRAMS
POSTULATED PARTICLES
SPIN ORIENTATION
TWO-DIMENSIONAL CALCULATIONS
COPPER COMPOUNDS
DIAGRAMS
ELEMENTARY PARTICLES
INVARIANCE PRINCIPLES
ORIENTATION
OXYGEN COMPOUNDS
SYMMETRY
TRANSITION ELEMENT COMPOUNDS
665411* - Basic Superconductivity Studies- (1992-)