Disorder induced phase transition in a two-dimensional random quantum antiferromagnet

Journal Article · Mon Feb 13 04:00:00 EST 1995 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.74.1226· OSTI ID:6405701

Sandvik, A W; Vekic, M ^[1]

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1. Department of Physics, University of California, Santa Barbara, California 93106 (United States)

A two-dimensional Heisenberg model with random antiferromagnetic nearest-neighbor exchange is studied using quantum Monte Carlo techniques. As the strength of the randomness is increased, the system undergoes a transition from an antiferromagnetically ordered ground state to a gapless disordered state. The finite-size scaling of the staggered structure factor and susceptibility is consistent with a dynamic exponent [ital z]=2.

• DOE Contract Number: FG03-85ER45197
• OSTI ID: 6405701
• Journal Information: Physical Review Letters; (United States), Journal Name: Physical Review Letters; (United States) Vol. 74:7; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

661300* -- Other Aspects of Physical Science-- (1992-)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ANTIFERROMAGNETISM
CALCULATION METHODS
CRYSTAL MODELS
ENERGY LEVELS
EXCHANGE INTERACTIONS
GROUND STATES
HEISENBERG MODEL
INTERACTIONS
MAGNETISM
MATHEMATICAL MODELS
MONTE CARLO METHOD
ORDER-DISORDER TRANSFORMATIONS
PHASE TRANSFORMATIONS
SCALING LAWS
TWO-DIMENSIONAL CALCULATIONS