Insulator-metal transition and the magnetic phase diagram of La1-xTexMnO3

Details Insulator-metal transition and the magnetic phase diagram of La1-xTexMnO3 Insulator-metal transition and the magnetic phase diagram of La1-xTexMnO3

2004-08-13

arxiv.org/abs/cond-mat/0408307v1

Physics

Condensed Matter

Strongly Correlated Electrons

20 pages,7 figures, submitted to materials chemistry and physics

Scientific paper

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 , 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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