Insulator-metal transition and the magnetic phase diagram of La1-xTexMnO3
J. Yang, W. H. Song, Y. Q. Ma, R. L. Zhang, B. C. Zhao, Z. G. Sheng, G. H. Zheng, J. M. Dai, Y. P. Sun
Abstract
The structural, electrical transport and magnetic properties of perovskite oxides La1-xTexMnO3 have been investigated and thus the magnetic phase diagram of La1-xTexMnO3 compounds as a function of temperature and the doping level x has been obtained. All samples have rhombohedral structure and undergo paramagnetic-ferromagnetic (PM-FM) transition accompanied with metal-insulator transition (MIT). Whereas a charge ordering (CO) transition begins to appear at for the sample with x=0.60. Moreover, the variation of the Curie temperature and the MIT temperature is quite complex and the results are discussed in terms of three factors including the average A-site cation radius <rA>, the size mismatch and the Te content. In addition, there has an evident magnetoresistance (MR) at low temperatures for all samples.
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