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Phase separation and abnormal transport behaviours in La0.7-xGdxSr0.3MnO3 system
Authors:Liu Ning  Tong Wei and Zhang Yu-Heng
Institution:Department of Physics, Suzhou Advanced Normal College, Suzhou 234000, China; Structure Research Laboratory, University of Science and Technology of China, Hefei 230026, China; Structure Research Laboratory, University of Science and Technology of China, Hefei 230026, China
Abstract:The magnetic and transport behaviours of the La_{0.7-x}Gd_xSr_{0.3}MnO_3 (0≤x≤0.70) system are investigated. The experimental results indicate that with increasing Gd doping content, the magnetism of the system changes from the long-range ferromagnetic order state to the cluster-spin glass state, then to the antiferromagnetic (AFM) state. It is interesting that the phase separation appears at x=0.30 and 0.40 and disappears for x≥0.50 where the AFM state occurs. At high doping content, the transport behaviours exhibit abnormality, e.g. there are two temperature ranges in which the ρ-T curves can be well fitted by a variable-range hopping (VRH) model. We suggest that the VRH does not come from the hopping of carriers between clusters, but from the different magnetic backgrounds in the clusters.
Keywords:magnetic structure  phase separation  abnormal transport behaviours
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