Volume 48, Number 2, October II 1999
|Page(s)||215 - 220|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|Published online||01 September 2002|
Inelastic polarised neutron scattering in the triangular-lattice antiferromagnet : An experimental proof of the chiral universality
Petersburg Nuclear Physics Institute, RAS, Gatchina - St. Petersburg, 188350 Russia
2 Institut Laue-Langevin - BP 15, 38042 Grenoble Cedex 9, France
3 Physikalisches Institut, Universität Karlsruhe - 76128 Karlsruhe, Germany
4 Department of Physics, University of Warwick - Coventry CV4 7AL, UK
Accepted: 30 August 1999
The temperature behaviour of the polarisation-dependent part of the differential cross-section of inelastic neutron scattering is investigated for the triangular-lattice antiferromagnet in the critical region above TN with the external magnetic field , applied along the hexagonal axis c, or the scattering vector Q(1/3 1/3 1). In the range of reduced temperature restricted by the resolution, this part of the cross-section, which is determined by the projection of a chiral fluctuation on the field-induced magnetisation, follows a power law of reduced temperature with the critical chiral crossover exponent . This is the first chiral critical exponent determined experimentally, which gives a direct proof of the chiral universality.
PACS: 75.25.+z – Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source X-ray scattering, etc.) / 75.40.Gb – Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.) / 75.40.-s – Critical-point effects, specific heat, short-range order
© EDP Sciences, 1999
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