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Spin dynamics of a Heisenberg S = 12 antiferromagnetic chain

Author

Listed:
  • Cowley, R.A.
  • Tennant, D.A.
  • Perring, T.G.
  • Nagler, S.E.
  • Tsvelik, A.M.

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.

Suggested Citation

  • Cowley, R.A. & Tennant, D.A. & Perring, T.G. & Nagler, S.E. & Tsvelik, A.M., 1993. "Spin dynamics of a Heisenberg S = 12 antiferromagnetic chain," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 194(1), pages 280-287.
    • Handle: RePEc:eee:phsmap:v:194:y:1993:i:1:p:280-287
    DOI: 10.1016/0378-4371(93)90360-G
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