Magnetic properties of LaNi 1-xMn xO 3+δ perovskites |
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| Authors: | J. Blasco J. García M.C. Sánchez J. Campo G. Subías J. Pérez-Cacho |
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| Affiliation: | (1) Instituto de Ciencia de Materiales de Aragón and Departamento de Física de la Materia Condensada, Consejo Superior de Investigaciones Científicas y Universidad de Zaragoza, 50009 Zaragoza, Spain, ES;(2) Institut Laue-Langevin, BP 156, 38042 Grenoble Cédex 9, France, FR;(3) ESRF, BP 220, 38043 Grenoble, France, FR |
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| Abstract: | Magnetic measurements have been carried out in different LaNi1-xMnxO 3 + δ samples with 0.1 ⩽ x ⩽ 0.9. All these samples show two magnetic anomalies, one at relatively high temperature characteristic of a ferromagnetic ordering and the other at low temperature, typical of magnetic relaxation phenomena. Neutron diffraction patterns indicate that long-range ferromagnetic ordering is only achieved for x ≥ 0.5. Neutron patterns of LaNi0.5Mn0.5O 3 + δ samples show an ordered arrangement of Ni and Mn atoms in the perovskite lattice. LaNi0.5Mn0.5O 3 + δ is then, a double perovskite A2BB'O6 whereas Ni and Mn atoms are randomly distributed for the rest of the samples. X-ray magnetic circular dichroism experiments confirm the presence of collinear ferromagnetism in LaNi0.5Mn0.5O 3 + δ . The role of competitive magnetic interactions, structural disorder, magnetic anisotropy and magnetic disaccommodation is also discussed Received 19 July 2002 / Received in final form 23 October 2002 Published online 31 December 2002 |
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| Keywords: | PACS. 75.25.+z Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source X-ray scattering, etc.) – 75.10.Nr Spin-glass and other random models – 61.12.-q Neutron diffraction and scattering – 75.50.Dd Nonmetallic ferromagnetic materials |
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