The magnetic state of the weakly anion-excess manganite LaMnO3+delta

摘要

This paper deals with the magnetic state of the weakly anion-excess lanthanum manganite LaMnO3+delta (delta approximate to 0.0375). The temperature and field dependences of the magnetic moment of single crystal samples are studied in detail for temperatures of 2-350K in different fields up to 5 T along the c-axis. The field dependence of the observed singular temperature points, such as those for magnetic ordering, magnetic vitrification, and magnetic phase separation, is recovered. The magnetic field behavior of several of the singular points is found to be interrelated. These results are fully consistent with models of magnetic phase separation that predict the formation of self-localized states such as nanoscale ferromagnetic droplets in a bulk antiferromagnetic matrix. Published by AIP Publishing.