Spin-spiral states in undoped manganites
Strongly Correlated Electrons
2010-07-15 v2
Abstract
The experimental observation of multiferroic behavior in perovskite manganites with a spiral spin structure demands to clarify the origin of these magnetic states and their relation to ferroelectricity. We show that spin-spiral phases with diagonal wavevector and also the E-type phase exist for intermediate values of the Hund's rule and the Jahn-Teller coupling in the orbitally ordered and insulating state of the standard two-band model Hamiltonian for manganites. Our results support the spin-current mechanism for ferroelectricity and present an alternative view to earlier conclusions where frustrating superexchange couplings were crucial to obtain spin-spiral states.
Keywords
Cite
@article{arxiv.0905.4811,
title = {Spin-spiral states in undoped manganites},
author = {Sanjeev Kumar and Jeroen van den Brink and Arno P. Kampf},
journal= {arXiv preprint arXiv:0905.4811},
year = {2010}
}
Comments
typos fixed, figures 2 and 3 modified