General Theory for the Ferroelectric Polarization Induced by Spin-Spiral Order

Details General Theory for the Ferroelectric Polarization Induced by Spin-Spiral Order General Theory for the Ferroelectric Polarization Induced by Spin-Spiral Order

2011-09-07

arxiv.org/abs/1109.1328v1

Phys. Rev. Lett. 107, 157202 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

Accepted for publication in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.107.157202

The ferroelectric polarization of triangular-lattice antiferromagnets induced by helical spin-spiral order is not explained by any existing model of magnetic-order-driven ferroelectricity. We resolve this problem by developing a general theory for the ferroelectric polarization induced by spin-spiral order and then by evaluating the coefficients needed to specify the general theory on the basis of density functional calculations. Our theory correctly describes the ferroelectricity of triangular-lattice antiferromagnets driven by helical spin-spiral order, and incorporates known models of magnetic-order-driven ferroelectricity as special cases.

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