Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-05-29
Phys. Rev. Lett. 104, 017201 (2010)
Physics
Condensed Matter
Strongly Correlated Electrons
typos fixed, figures 2 and 3 modified
Scientific paper
10.1103/PhysRevLett.104.017201
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.
Kampf Arno P.
Kumar Sanjeev
van den Brink Jeroen
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