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Spin dynamics of the 2D spin 1/2 quantum antiferromagnet copper deuteroformate tetradeuterate (CFTD)

Ronnow, H.M.; McMorrow, D.F.; Coldea, R.; Harrison, A.; Youngson, I.D.; Perring, T.G.; Aeppli, G.; ... Rischel, C.; + view all (2001) Spin dynamics of the 2D spin 1/2 quantum antiferromagnet copper deuteroformate tetradeuterate (CFTD). Physical Review Letters , 87 (3) , Article 037202. 10.1103/PhysRevLett.87.037202. Green open access

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Abstract

The magnetic excitation spectrum in the two-dimensional (2D) S = 1/2 Heisenberg antiferromagnet copper deuteroformate tetradeuterate has been measured for temperatures up to T∼J/2, where J = 6.31±0.02 meV is the 2D exchange coupling. For T≪J, a dispersion of the zone boundary energy is observed, which is attributed to a wave vector dependent quantum renormalization. At higher temperatures, spin-wavelike excitations persist, but are found to broaden and soften. By combining our data with numerical calculations, and with existing theoretical work, a consistent description of the behavior of the model system is found over the whole temperature interval investigated.

Type: Article
Title: Spin dynamics of the 2D spin 1/2 quantum antiferromagnet copper deuteroformate tetradeuterate (CFTD)
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.87.037202
Publisher version: http://dx.doi.org/10.1103/PhysRevLett.87.037202
Language: English
Additional information: © 2001 The American Physical Society
UCL classification: UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: https://discovery.ucl.ac.uk/id/eprint/9762
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