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Author Gelfand, M. P.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PHYSICS ♦ ANTIFERROMAGNETISM ♦ SPIN WAVES ♦ TEMPERATURE ZERO K ♦ LAYERS ♦ DIMERS ♦ SERIES EXPANSION ♦ HEISENBERG MODEL ♦ MAGNETIC SUSCEPTIBILITY ♦ VELOCITY ♦ DISPERSION RELATIONS ♦ PERTURBATION THEORY
Abstract Series expansions about the interlayer dimer limit are calculated to eighth order in the intralayer coupling for the {ital T}=0 antiferromagnetic susceptibility and elementary excitation spectrum of the two-layer, {ital S}=1/2, square lattice Heisenberg antiferromagnet. Extrapolations of the susceptibility and the gap series yield an estimate of the critical interlayer/intralayer coupling ratio {ital J}{sub 2}/{ital J}{sub 1}=2.54{plus_minus}0.02, in agreement with several previous numerical calculations. The spin-wave velocity at criticality is determined by an analysis of the excitation spectrum series: the result, {h_bar}{ital c}/{ital J}{sub 1}{ital a}=1.89{plus_minus}0.02, is very precise and consistent with other estimates based on numerical calculations at finite temperature. The critical spin-wave dispersion at general wave vectors is shown to deviate significantly from a uniformly renormalized mean-field spectrum. {copyright} {ital 1996 The American Physical Society.}
ISSN 01631829
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-05-01
Publisher Place United States
Journal Physical Review, B: Condensed Matter
Volume Number 53
Issue Number 17


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