| Issue |
Europhys. Lett.
Volume 34, Number 4, May I 1996
|
|
|---|---|---|
| Page(s) | 293 - 298 | |
| Section | Condensed matter: electronic structure, electrical, magnetic and optical properties | |
| DOI | https://doi.org/10.1209/epl/i1996-00453-y | |
| Published online | 01 September 2002 | |
Magnetic excitations and quantum fluctuation in the covalent-chain antiferromagnet TlFeS2
1
Hahn-Meitner-Institut - Postfach 390128, D-14091 Berlin, Germany
2
Rutherford Appleton Laboratory - Chilton, Didcot, Oxfordshire, UK
Received:
3
November
1995
Accepted:
14
March
1996
Magnetic excitations in the covalent-chain antiferromagnet
with a low ordered spin 
were studied by
time-of-flight neutron scattering. The scattering intensities are in agreement with a
non-interacting multi-magnon model for intrinsic spins 
and a
zero-point quantum reduction 
, confirming the 
predicted from the spin-wave energy dispersion. No evidence is found for charge fluctuation
on the spin-wave energy scale. A local-moment Heisenberg Hamiltonian and conventional
harmonic spin-wave theory thus apply to Néel-ordered , where the two-magnon signal
allows to determine the unknown local spin S.
PACS: 75.10.Jm – Quantized spin models / 75.30.-m – Magnetically ordered materials: other intrinsic properties / 75.50.Ee – Antiferromagnetics
© EDP Sciences, 1996
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