Spin dynamics of a Heisenberg S = 12 antiferromagnetic chain

R.A. Cowley, D.A. Tennant, T.G. Perring, S.E. Nagler and A.M. Tsvelik

Physica A: Statistical Mechanics and its Applications, 1993, vol. 194, issue 1, 280-287

Abstract: Neutron scattering techniques have been used to study the effect of quantum fluctuations on the excitation spectrum of the S = 12 Heisenberg antiferromagnetic chains in KCuF3. The experiments were performed using the MARI time-of-flight spectrometer on the ISIS pulsed source at the Rutherford Appleton Laboratory. The results show that at low temperatures there is a continuum of excitations well described by the ansatz of Müller et al. On heating the low energy part of the spectrum evolves as predicted by a continuum theory for the excitations, but more work is needed to develop a full temperature dependent theory.

Date: 1993
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:194:y:1993:i:1:p:280-287

DOI: 10.1016/0378-4371(93)90360-G

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