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CEF nature of the magnetic excitations in ordered HoNi B C |
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| Authors: | N Cavadini Th Strässle P Allenspach PC Canfield Ph Bourges |
| Institution: | (1) Laboratory for Neutron Scattering, ETH Zürich & Paul Scherrer Institut, 5232 Villigen PSI, Switzerland, CH;(2) Ames Laboratory, Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA, US;(3) Laboratoire Léon Brillouin, CEA/CNRS-Saclay, 91191 Gif-sur-Yvette, France, FR |
| Abstract: | The magnetic excitations in the antiferromagnetic phase of HoNi2B2C are studied by inelastic neutron scattering on single crystals for the first time. Spectra measured at constant T = 2 K along symmetry directions of the reciprocal space are well explained in terms of crystal electric field (CEF) magnetic excitons within the J = 8 ground state multiplet of Ho3+. Very modest bandwidth with planar energy dispersion describes the magnetic exciton dynamics. A perturbative model approach consisting of the CEF states in the effective exchange mean-field provides a simple but applicable characterization of the experimental observations. The microscopic determination of the relevant exchange parameters is discussed in connection with previous works on the subject. Received 25 February 2002 / Received in final form 13 May 2002 Published online 14 October 2002 RID="a" ID="a"e-mail: nordal.cavadini@psi.ch |
| Keywords: | PACS 74 70 Dd Ternary quaternary and multinary compounds – 75 10 Dg Crystal-field theory and spin Hamiltonians – 78 70 Nx Neutron inelastic scattering |
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