Dramatic changes in the magnetic coupling mechanism for La-doped CaMnO3

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...

Full description

Saved in:
Bibliographic Details
Published in:Physical review letters 2001-06, Vol.86 (23), p.5385-5388
Main Authors: Granado, E, Moreno, N O, Martinho, H, García, A, Sanjurjo, J A, Torriani, I, Rettori, C, Neumeier, J J, Oseroff, S B
Format: Article
Language:English
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:0031-9007
DOI:10.1103/PhysRevLett.86.5385