Charge ordering in rare-earth manganese oxides

Abstract

Based on the interacting small polaron model, we have investigated charge ordering (CO) phenomena observed in half-doped manganites R(1/2)A(1/2)MnO(3). First, we have examined the charge gap formation in the single particle electronic structure in the CO phase. Second, we have studied the renormalization of the sound velocity around T(CO), and compared the origin of the renormalization in the CO phase with that in the low doping metallic phase. (C) 1999 Elsevier Science B.V. All rights reserved.