Field-induced spin-flip and spin-flip transitions in PrGa2 |
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Authors: | A.R. Ball D. Gignoux D. Schmitt F.Y. Zhang P. Burlet |
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Affiliation: | a Laboratoire Louis Néel, CNRS, 166X, 38042, Grenoble Cedex, France b Centre d'Etudes Nucléaires de Grenoble, DRF, 85X, 38041, Grenoble Cedex, France |
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Abstract: | A detailed neutron diffraction study of a single crystal of hexagonal PrGa2 under an applied field is presented. The field is applied along the easy [100] direction of the hexagonal plane. The compound exhibits several field-induced magnetic structures and, in particular, an uncompensated long period commensurate antiphase structure defined by the propagation vector (4/27, 4/27, 0) at zero field and below Tt = 3.5 K. Concerning the intermediate magnetic structures below Tt, two types of magnetic phase transitions are observed: a spin-flip transition where one moment per magnetic cell turns over, and a spin-slip transition from the low field commensurate propagation vector (4/27, 4/27, 0) to another commensurate vector (1/7, 1/7, 0). Between Tt and TN = 7.2 K, the structure becomes apmlitude-modulated with a propagation vector (0.148, 0.148, 0.023). Important and original magnetic domain effects are also observed due to the high degeneracy of the easy direction of the hexagonal plane in both T<Tt and Tt<T<TN regions. |
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