Correlated electronic and magnetic peculiarities of La2NiO4+δ: Charge and spin ordering*
Laboratoire de Cristallographie, CNRS, B.P. 166, 38042 Grenoble Cedex 9, France
2 CRPHT-CNRS 45071 Orléans Cedex 2, France
Accepted: 30 November 1998
Published online: 15 February 1999
Electronic and magnetic peculiarities of La2NiO4+δ are discussed emphasizing charge and spin ordering phenomena. Macroscopic measurements of conductivity (dc, optical) and magnetic susceptibility on samples of well-known oxygen stoichiometries agree to show anomalies where this peculiar ordering is expected. Our data account for the heterogeneous nature of the magnetism. The susceptibility which is quasi temperature independent in a large T range is modeled by a system of spins cluster.
PACS: 75.25.+z – Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source X-ray scattering, etc.) / 78.30.-j – Infrared and Raman spectra / 72.90.+y – Other topics in electronic transport in condensed matter
© EDP Sciences, 1999