ar X iv : c on d - m at / 0 21 06 09 28 O ct 2 00 2 Structural , electric and magnetic properties of the electron - doped manganese oxide

In this letter, the electrical and magnetic properties of La 1-x Te x MnO 3 (x=0.1, 0.15), which is a new material and shows good colossal magnetoresistance (CMR) behavior, have been investigated. These compounds have rhombohedral structure. In this materical, Te replaced a part of La ions, which induced the lattice cell constriction and Mn-O-Mn bond angle widening. X-ray photoemission spectroscopy (XPS) measurement revealed that the Te ions were in the tetravalent state and the manganese ions could be considered as in a mixture state of Mn 2+ and Mn 3+. Thus the material could be viewed as an electron-doped compound. The Curie temperature (Tc) was about 240 K and 255 K for x=0.1, 0.15, respectively. The maximum magnetoresistance ratio MR=) 0 (/)] () 0 ([ ρ ρ ρ H − was about 51% at 200 K and in the applied magnetic field of 40 kOe.