Could in-plane exchange anisotropy induce the observed antiferromagnetic transitions in the undoped high- T sub c materials

Journal Article · Mon Mar 23 00:00:00 EST 1992 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.68.1927· OSTI ID:7048292

Ding, H ^[1]

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1. Materials Simulation Center, Beckman Institute, California Institute of Technology, Pasadena, California 91125 (United States)

A tiny in-plane {ital XY} anisotropy {lambda}=0.02 could induce a substantially high Kosterlitz-Thouless phase transition at {ital kT}{sub {ital c}}/{ital J}=0.25 in the 2D spin-1/2 antiferromagnet. Examination of transverse and longitudinal correlations indicates a Heisenberg-to-{ital XY} crossover near {ital T}{sub {ital c}}, with a scaling relation suggesting an ordering transition at {ital T}{sub {ital c}}{similar to}250 K for the anisotropies measured in the undoped high-{ital T}{sub {ital c}} copper oxides. The results also have implications for Kosterlitz-Thouless condensation in general 2D quantum systems.

• DOE Contract Number: FG03-85ER25009
• OSTI ID: 7048292
• Journal Information: Physical Review Letters; (United States), Vol. 68:12; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
HIGH-TC SUPERCONDUCTORS
ANTIFERROMAGNETISM
ANISOTROPY
COMPUTERIZED SIMULATION
HEISENBERG MODEL
MONTE CARLO METHOD
PHASE TRANSFORMATIONS
SCALING LAWS
TRANSITION TEMPERATURE
TWO-DIMENSIONAL CALCULATIONS
CRYSTAL MODELS
MAGNETISM
MATHEMATICAL MODELS
PHYSICAL PROPERTIES
SIMULATION
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
360204* - Ceramics
Cermets
& Refractories- Physical Properties