High-Tc ferrolectricity emerging from magnetic degeneracy in cupric oxide

Details High-Tc ferrolectricity emerging from magnetic degeneracy in cupric oxide High-Tc ferrolectricity emerging from magnetic degeneracy in cupric oxide

2010-07-19

arxiv.org/abs/1007.3220v2

Phys. Rev. Lett. 106, 026401 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures, figures and text substantially improved. Title changed

Scientific paper

Cupric oxide is multiferroic at unusual high temperatures. From density functional calculations we find that the low-T magnetic phase is paraelectric and the higher-T one ferroelectric, with a size and direction of polarization in good agreement with experiment. By mapping of the ab initio results on an effective spin model we find with Monte Carlo that in the high-T magnetic state non-collinearity and inversion symmetry breaking stabilize each other via the Dzyaloshinskii Moriya interaction. This leads to a novel mechanism for multiferroicity, with the particular property that non-magnetic impurities enhance the effect.

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