Magnetic Behaviour in the System La1.33NaxMnxTi2−xO6

Abstract

A series of perovskite‐type complex oxides of general formula La1.33NaxMnxTi2−xO6 (x = 0.66, 0.55 and 0.44) have been obtained and characterised. Magnetic susceptibility measurements on these phases follow a Curie−Weiss‐like dependence at high temperatures, although a more complex variation is observed at lower temperatures. The thermal variation of M/H from zero‐field‐cooled and field‐cooled susceptibility measurements shows irreversible processes and magnetisation isotherms that differ from typical ferromagnetic behaviour. Neutron diffraction data collected at low temperature show no extra magnetic contribution in the nuclear peaks nor extra reflections. All the measurements carried out on this series, such as magnetic susceptibility (dc and ac), magnetisation and neutron diffraction can be interpreted as being due to a spin‐glass behaviour. (© Wiley‐VCH Verlag GmbH, 69451 Weinheim, Germany, 2002)