Spinons in the strongly correlated copper oxide chains in SrCuO2

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Date
2004-08-20
Journal Title
Journal ISSN
Volume Title
Publisher
American Physical Society
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.
Description
Keywords
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
Citation
Physical Review Letters 20 Aug. 2004, vol.93, no.8, pp. 087202/1-4