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Spin-spiral states in undoped manganites

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.

preprint2010arXivOpen access
Sanjeev KumarJeroen van den BrinkArno P. Kampf
cond-mat.str-el
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Sanjeev KumarJeroen van den BrinkArno P. Kampf

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