Spinons in the strongly correlated copper oxide chains in SrCuO2

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Title: Spinons in the strongly correlated copper oxide chains in SrCuO2
Author: Broholm, C.; Perring, T.G.; Takagi, H.; Frost, C.D.; Zaliznyak, L.A.; Woo, H.
Abstract: We have investigated the spin dynamics in the strongly correlated chain copper oxide SrCuO2 for energies up to ≥0.6 eV using inelastic neutron scattering. We observe a gapless continuum of magnetic excitations, which is well described by the 'Muller ansatz' for the two-spinon continuum in the S=1/2 antiferromagnetic Heisenberg spin chain. The lower boundary of the continuum extends up to ≈360 meV, which corresponds to an exchange constant J=226(12) meV.
URI: http://jhir.library.jhu.edu/handle/1774.2/33754
Date: 2004-08-20
Citation: Physical Review Letters 20 Aug. 2004, vol.93, no.8, pp. 087202/1-4
Subject: strongly correlated copper oxide chains
exchange constant
strongly correlated electron systems;
Heisenberg model
strontium compounds
spinons
magnetic excitations
antiferromagnetic materials
SrCuO2
spin dynamics
antiferromagnetic Heisenberg spin chain
lower boundary
two-spinon continuum
neutron scattering
gapless continuum

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