1.
Phys Rev Lett
; 86(23): 5385-8, 2001 Jun 04.
Article
in English
| MEDLINE
| ID: mdl-11384504
ABSTRACT
The exchange interactions in polycrystalline samples of Ca1-xLaxMnO3 (0.00< or =x< or =0.05) are studied by means of Raman scattering and electron paramagnetic resonance. Dramatic reductions in the spin-phonon interactions and magnetic correlations are observed for La doping levels as small as approximately 2%-3%. These results show that the charge carriers play an important role in the overall exchange coupling in the electron-doped manganites, even at very low doping levels.