Spin dynamics in the square-lattice antiferromagnet

Journal Article · Mon Aug 01 04:00:00 EDT 1988 · Phys. Rev. Lett.; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.61.617· OSTI ID:6866468

Auerbach, A; Arovas, D P

We apply the Schwinger boson mean-field theory to the square-lattice Heisenberg antiferromagnet at low temperatures. For spin (1/2 we confirm the renormalized classical behavior of the correlation length kappa/sup -1/(T) without appealing to spin-wave theory. We also present a detailed calculation of the dynamical structure factor. A quasielastic peak is featured near q = (..pi..,..pi..), while for chemically bondq-(..pi..,..pi..)chemically bond>>kappa, spin-wave ridges appear. The uniform susceptibility interpolates between spin-wave results at T = 0 and the high-temperature series of Rushbrooke and Wood. Our theory is distinct from theories in which fermionic spinon excitations determine the low-temperature spin dynamics.

• Research Organization: Physics Department, Brookhaven National Laboratory, Upton, New York 11973
• OSTI ID: 6866468
• Journal Information: Phys. Rev. Lett.; (United States), Journal Name: Phys. Rev. Lett.; (United States) Vol. 61:5; ISSN PRLTA
• Country of Publication: United States
• Language: English

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36 MATERIALS SCIENCE
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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANTIFERROMAGNETIC MATERIALS
ANTIFERROMAGNETISM
CRYSTAL MODELS
HEISENBERG MODEL
MAGNETIC MATERIALS
MAGNETIC PROPERTIES
MAGNETIC SPECIFIC HEAT
MAGNETIC SUSCEPTIBILITY
MAGNETISM
MATERIALS
MATHEMATICAL MODELS
MEAN-FIELD THEORY
PHYSICAL PROPERTIES
QUASI PARTICLES
SPECIFIC HEAT
SPIN WAVES
STRUCTURE FACTORS
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES