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

Journal Article · Fri Apr 01 04:00:00 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]

---

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

Related Subjects

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