UNSPECIFIED (1994) SPIN-WAVES AND TEMPERATURE-DEPENDENT BEHAVIOR OF THE QUASI-2-DIMENSIONAL ANTIFERROMAGNET KFEF4. JOURNAL OF PHYSICS-CONDENSED MATTER, 6 (33). pp. 6667-6678. ISSN 0953-8984

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Abstract

A study of the quasi-two-dimensional antiferromagnet KFeF4 below the transition temperature, T(N) = 13 K, has been undertaken using neutron scattering techniques. The dispersion relation of the spin excitations is well described by a model Hamiltonian incorporating Heisenberg exchange interactions and uniaxial anisotropy. The anisotropy controls the energy of the zone centre mode whose frequency varies in the same way with temperature as the square of the staggered magnetization which is described by the two-dimensional Ising model. Dipole-dipole contributions are too small to account fully for the anisotropy. Different nearest-neighbour exchange energies are found along the a and b directions due to different superexchange paths, with J1 = -2.18 meV along a, and J2 = -2.73 meV along b.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Journal or Publication Title:	JOURNAL OF PHYSICS-CONDENSED MATTER
Publisher:	IOP PUBLISHING LTD
ISSN:	0953-8984
Date:	15 August 1994
Volume:	6
Number:	33
Number of Pages:	12
Page Range:	pp. 6667-6678
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/20379

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