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

TL;DR

This study explores the structural, electrical, and magnetic properties of La1-xTexMnO3, revealing complex phase transitions, charge ordering, and magnetoresistance behavior across different doping levels.

Contribution

It provides a detailed magnetic phase diagram of La1-xTexMnO3 as a function of temperature and doping, highlighting the effects of Te substitution on phase transitions.

Findings

All samples have rhombohedral structure.

Paramagnetic-ferromagnetic and metal-insulator transitions occur in all samples.

Charge ordering appears at x=0.60.

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.