STRUCTURAL AND TRANSPORT PROPERTIES OF TE DOPED LAMNO3

The main aim of this project is to study the structural and transport properties of La1 - xTexMnO3at (x=0.1 and 0.15). The brief discussion on the progress of this project is given that the samples were characterized using x - ray diffraction (XRD) technique. This gives the information of the crystal symmetry, structure and lattice parameters, which varies with the Te concentration. Further, the electrical resistivity data, w hich confirm the effect of carrier doping in the system, was analyzed. The resistivity data was also fitted in the Mott’s variable range hopping (VRH) model in the high temperature regime, as a result of those processes the unit cell volume of the sample d ecrease with the increase in Te concentration, the crystallite size increases with the increase in Te concentration. On decreasing the temperature thisLa1 - xTexMnO3 first undergoes insulating to metallic phase transition at transition temperatures Tp=203 an d 209oK respectively, then resuming the semiconducting behavior, the samples are found to be in single phase. The charge ordering transition temperature of La1 - xTexMnO3 is enhanced within Te concentration (Tco=125 to 135oK), the magneto resistance as a fun ction of temperature is also studied in the presence of magnetic of the magnetic fields.