Neutron Powder Diffraction Studies of the La_0.65Pb_0.35MnO₃ Perovskite

Authors

Camelia Borca, University of Nebraska-Lincoln
Shireen Adenwalla, University of Nebraska-LincolnFollow
Sy-Hwang Liou, University of Nebraska-LincolnFollow
Q.L. Xu, University of Nebraska-Lincoln
J. L. Robertson, Oak Ridge National Laboratory
Peter A. Dowben, University of Nebraska-LincolnFollow

Date of this Version

2002

Comments

Published in Materials Letters 57 (2002) 325– 329.

Abstract

The structure of La_0.65Pb_0.35MnO₃ has been studied by neutron powder diffraction. From the temperature dependence of the lattice parameters, we observe that La_0.65Pb_0.35MnO₃ remains single phase in the temperature interval from 25 to 400 K, with a rhombohedral (R3c) structure. The collinear Mn spins suffer a thermally driven reorientation transition close to the Curie temperature, as obtained from powder samples (using neutron diffraction) and from thin films [using ferromagnetic resonance (FMR)]. The reorientation transition may indicate the presence of local Jahn–Teller (JT) lattice distortions, which are prevented from developing with long-range order in the R3c crystal structure.