J. Phys. IV France
Volume 09, Numéro PR10, December 1999
International Workshop on Electronic Crystals
Page(s) Pr10-335 - Pr10-336
International Workshop on Electronic Crystals

J. Phys. IV France 09 (1999) Pr10-335-Pr10-336

DOI: 10.1051/jp4:19991089

Role of electron-lattice interactions in determining the magnetic structure of insulating manganites

M. Capone1, D. Feinberg2 and M. Grilli3

1  International School for Advanced Studies, Miramare, Trieste, Italy
2  Laboratoire des Propriétés Électroniques des Solides, CNRS, BP. 166, 38042 Grenoble, France
3  Istituto Nazionale di Fisica della Materia and Dipartimento di Fisica, Università di Roma "La Sapienza", P.le Moro 2, 00185 Roma, Italy

Together with the strong electron-electron interactions, the role of the lattice distorsions turns out to be relevant in determining the specific magnetic structure of some insulating manganites. In particular, while a substantial Jahn-Teller distorsion is needed to account for the layered antiferromagnetic structure of LaMnO3, the observed collective shear of alternate ions in La0.5Ca0.5MnO3 is required to stabilize the CE magnetic structure of this compounds. The specific action of the lattice in stabilizing these peculiar magnetic orderings is thus clarified.

© EDP Sciences 1999