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Temperature evolution of the umbrella structure in holmium iron garnet

Authors:	M Guillot F Tchéou A Marchand P Feldmann

Institution:	(1) Laboratoire Louis Néel, CNRS-USMG, 166X, F-38042 Grenoble, France;(2) Present address: DRF/CEN-G, B.P. 85X, F-38041 Grenoble Cedex, France;(3) Present address: Laboratoire de Magnétisme et d'Optique des Solides, 1, Place Aristide-Briand, F-92190 Meudon-Bellevue, France

Abstract:	Using neutron diffraction data, the thermal evolution of the magnetic structure of Ho₃Fe₅O₁₂ has been studied. Below the compensation temperature (T _comp=137 K), the umbrella structure parameters which fit the spontaneous ferrite magnetizations have been determined. AboveT _comp, the compound behaves as a Néel type ferrimagnet. Particular attentions have been given to the magnetic form factors of both iron sublattice on one hand and on the other hand to a rhombohedral distorsion fromI a3d toR $\bar 3$ below 30 K and in first approximation toR $\bar 3$ c forT>30 K.

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