https://doi.org/10.1140/epjb/e2002-00403-7
Magnetic properties of LaNi1-xMnxO3+δ perovskites
1
Instituto de Ciencia de Materiales de Aragón and Departamento de Fíísica de la Materia
Condensada, Consejo Superior de Investigaciones Científicas y Universidad de
Zaragoza, 50009 Zaragoza, Spain
2
Institut Laue-Langevin, BP 156, 38042 Grenoble Cédex 9, France
3
ESRF, BP 220, 38043 Grenoble, France
Corresponding author: a jbc@posta.unizar.es
Received:
19
July
2002
Revised:
23
October
2002
Published online:
31
December
2002
Magnetic measurements have been carried out in different LaNi1-xMnxO3+δ
samples with
. 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 
. Neutron patterns of
LaNi0.5Mn0.5O3+δ samples show an ordered arrangement of Ni and Mn atoms in the
perovskite lattice. LaNi0.5Mn0.5O3+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
LaNi0.5Mn0.5O3+δ. The role of competitive magnetic interactions, structural disorder,
magnetic anisotropy and magnetic disaccommodation is also discussed
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
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2002
