Phase separation and abnormal transport behaviours in La0.7-xGdxSr0.3MnO3 system
Liu Ning (刘宁)ab, Tong Wei (童伟)b, Zhang Yu-Heng (张裕恒)b
a Department of Physics, Suzhou Advanced Normal College, Suzhou 234000, China; b 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$_x$Sr$_{0.3}$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 $\rho$－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.
Received: 24 September 2003
Revised: 12 February 2004
Accepted manuscript online:
(Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.))
Fund: Project supported by the National Natural Science Foundation of China (Grant No 10334090) and the State Key Development Programme for Basic Research of China (Grant No 001CB610604).
Cite this article:
Liu Ning (刘宁), Tong Wei (童伟), Zhang Yu-Heng (张裕恒) Phase separation and abnormal transport behaviours in La0.7-xGdxSr0.3MnO3 system 2004 Chinese Physics 13 958
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