Abnormality of Magnetic Behavior and Resistivity of La0.7xDyxSr0.3MnO3 (0.00x0.30) System at Low Temperature

Abstract

By measuring M-T curves, -T curves and M R-T curves of the samples under different temperatures, the influence of Dy doping (0:00 x 0:30) on the magnetic and electric properties of La0.7xDyxSr0.3MnO3 has been studied. The experimental results show that, with the increase of the Dy content, the system undergoes a transition from long range ferromagnetic order to the cluster-spin glass state and further to antiferromagnetic order. For the samples with x=0.20 and 0.30, their magnetic behaviors are abnormal at low temperature, and their resistivities at low temperature have a minimum value. These peculiar phenomena not only come from the lattice effect induced by doping, but also from extra magnetic coupling induced by doping.