Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2010-09-29
Phys. Rev. B 82, 184425 (2010)
Physics
Condensed Matter
Strongly Correlated Electrons
8 pages, 7 figures
Scientific paper
10.1103/PhysRevB.82.184425
We report measurements of the magnetic excitation spectrum of the layered antiferromagnet La2CoO4 by time-of-flight neutron inelastic scattering. In the energy range probed in our experiments (0-250 meV) the magnetic spectrum consists of spin-wave modes with strong in-plane dispersion extending up to 60 meV, and a nearly dispersionless peak at 190 meV. The spin-wave modes exhibit a small (~1 meV) dispersion along the magnetic zone boundary. We show that the magnetic spectrum can be described very well by a model of a Heisenberg antiferromagnet that includes the full spin and orbital degrees of freedom of Co2+ in an axially-distorted crystal field. The collective magnetic dynamics are found to be controlled by dominant nearest-neighbour exchange interactions, strong XY-like single-ion anisotropy and a substantial unquenched orbital angular momentum.
Babkevich P.
Boothroyd Andrew T.
Frost Carol D.
Prabhakaran Dharmalingam
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