Charge ordering in doped manganese oxides: lattice dynamics and magnetic structure

Abstract

Based on the Hamiltonian of small polarons with the strong nearest neighbor repulsion, we have investigated the charge ordering phenomena observed in half-doped manganites R_{1/2}A_{1/2}MnO_3. We have explored possible consequences of the charge ordering phase in the half-doped manganites. First, we have studied the renormalization of the sound velocity around $T_{CO}$, considering the acoustic phonons coupled to the electrons participating in the charge ordering. Second, we have found a new antiferromagnetic phase induced by the charge ordering, and discussed its role in connection with the specific CE-type antiferromagnetic structure observed in half-doped manganites.

arXiv comment5 pages, 2 Postscript figures. To appear in Phys. Rev. B - Rapid Comm. (01Jun97)

Cited by in corpus (5)

• Colossal Magnetoresistant Materials: The Key Role of Phase Separation
• Orbital ordering phenomena in $d$- and $f$-electron systems
• Jahn-Teller effect and stability of the charge-ordered state in La1-xCaxMnO3 (0.5<x<0.9) manganites
• Raman Scattering in charge ordered Pr_{0.63}Ca_{0.37}MnO_{3} : Anomalous Temperature Dependence of Linewidth
• Infrared absorption study of charge ordered $La{}_{0.5}Ca{}_{0.5-x}S{r}_{x}Mn{O}_3$ $(0.1\le x\le 0.5$