S=½ chain in a staggered field: high-energy bound-spinon state and the effects of a discrete lattice

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Title: S=½ chain in a staggered field: high-energy bound-spinon state and the effects of a discrete lattice
Author: Kenzelmann, M.; Batista, C.D.; Chen, Y.; Broholm, C.; Reich, D.H.; Park, S.; Qiu, Y.
Abstract: We report an experimental and theoretical study of the antiferromagnetic S=½ chain subject to uniform and staggered fields. Using inelastic neutron scattering, we observe a bound-spinon state at high energies in the linear chain compound CuCl2·2((CD3)2SO). The excitation is explained with a mean-field theory of interacting S=½ fermions and arises from the opening of a gap at the Fermi surface due to confining spinon interactions. The mean-field model also describes the wave-vector dependence of the bound-spinon states, particularly in regions where effects of the discrete lattice are important. We calculate the dynamic structure factor using exact diagonalization of finite length chains, obtaining excellent agreement with the experiments.
URI: http://jhir.library.jhu.edu/handle/1774.2/33753
Date: 2005-03-01
Citation: Physical Review B (Condensed Matter and Materials Physics) 1 March 2005, vol.71, no.9, pp. 94411-1-8
Subject: discrete lattice
staggered field
bound-spinon state
spin dynamics
fermion systems
Heisenberg model
neutron scattering
linear chain compound
mean-field theory
spinon interactions
Fermi surface
copper compounds
chlorine compounds
antiferromagnetic materials
wave-vector
dynamic structure factor
exact diagonalization
finite length chain

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