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, 118 (2), 027203

Incommensurate Spiral Order From Double-Exchange Interactions

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Incommensurate Spiral Order From Double-Exchange Interactions

Maria Azhar et al. Phys Rev Lett.

Abstract

The double-exchange model describing interactions of itinerant electrons with localized spins is usually used to explain ferromagnetism in metals. We show that for a variety of crystal lattices of different dimensionalities and for a wide range of model parameters, the ferromagnetic state is unstable against a noncollinear spiral magnetic order. We revisit the phase diagram of the double-exchange model on a triangular lattice and show in a large part of the diagram the incommensurate spiral state has a lower energy than the previously discussed commensurate states. These results indicate that double-exchange systems are inherently frustrated and can host unconventional spin orders.

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