Eur. Phys. J. AP 5, 123-126 (1999)
https://doi.org/10.1051/epjap:1999119

Correlated electronic and magnetic peculiarities of La₂NiO_4+δ: Charge and spin ordering^*

¹ Laboratoire de Cristallographie, CNRS, B.P. 166, 38042 Grenoble Cedex 9, France
² CRPHT-CNRS 45071 Orléans Cedex 2, France

Received: 14 April 1998
Accepted: 30 November 1998
Published online: 15 February 1999

Abstract

Electronic and magnetic peculiarities of La₂NiO_4+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.