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.
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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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