Magnetic properties of LaNi <Emphasis Type="Bold">1-</Emphasis><Emphasis Type="Bold">x</Emphasis>Mn <Emphasis Type="Bold">x</Emphasis>O <Emphasis Type="Bold">3+δ</Emphasis> perovskites |
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Authors: | J Blasco J García MC Sánchez J Campo G Subías J Pérez-Cacho |
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Institution: | (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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