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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
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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 , 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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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. 2004-08-13. Insulator-metal transition and the magnetic phase diagram of La1-xTexMnO3. https://arxiv.org/abs/cond-mat/0408307

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