Magnetic spectrum of the two-dimensional antiferromagnet La2CoO4 studied by inelastic neutron scattering

被引：29
作者：
Babkevich, P. [1 ,2 ]
Prabhakaran, D. [1 ]
Frost, C. D. [3 ]
Boothroyd, A. T. [1 ]
机构：
[1] Univ Oxford, Dept Phys, Oxford OX1 3PU, England
[2] Paul Scherrer Inst, Neutron Scattering Lab, CH-5232 Villigen, Switzerland
[3] Rutherford Appleton Lab, ISIS Facil, Didcot OX11 0QX, Oxon, England
来源：
PHYSICAL REVIEW B | 2010年 / 82卷 / 18期
基金：
英国工程与自然科学研究理事会;
关键词：
STRIPE ORDER; CHARGE; SPINS; HOLES;
D O I：
10.1103/PhysRevB.82.184425
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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 (similar to 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-neighbor exchange interactions, strong XY-like single-ion anisotropy and a substantial unquenched orbital angular momentum.
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页数：8
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