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Deviations from linear spin wave theory in the 2D, S=1/2 Heisenberg antiferromagnet CFTD

Christensen, NB; McMorrow, DF; Ronnow, HM; Harrison, A; Perring, TG; Coldea, R; (2004) Deviations from linear spin wave theory in the 2D, S=1/2 Heisenberg antiferromagnet CFTD. In: JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS. (pp. 896 - 897). ELSEVIER SCIENCE BV

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Abstract

The spin excitation spectrum in the 2D square lattice Heisenberg antiferromagnet CFTD has been investigated using time-of-flight neutron scattering. The magnon dispersion and intensities have been determined as a function of wavevector Q in the full Brillouin zone. Both quantities are found to deviate significantly from the predictions of linear spin wave theory for wavevectors in the vicinity of Q = (pi, 0), whereas good agreement is found near Q = (pi/2, pi/2). (C) 2004 Published by Elsevier B.V.

Type: Proceedings paper
Title: Deviations from linear spin wave theory in the 2D, S=1/2 Heisenberg antiferromagnet CFTD
Event: International Conference on Magnetism (ICM 2003)
Location: Rome, ITALY
Dates: 2003-07-27 - 2003-08-01
DOI: 10.1016/j.jmmm.2004.01.056
Keywords: antiferroinagnetism, spin wave, SQUARE LATTICE
UCL classification: UCL > School of BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/79777
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