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cond-mat.mtrl-sci2007
Comment on "Multiferroicity Induced by Dislocated Spin-Density Waves"
A. B. Harris
I show that the claims in Phys. Rev. Lett. 98, 257602 by Betouras et al concerning YMn2O5 are incorect.
cond-mat.mtrl-sci2006
Comment on: "Ferroelectricity in spiral magnets"
M. Kenzelmann, A. B. Harris
There is much interest in the physics of materials that show a strong coupling between magnetic and electric degrees of freedom. In a recent paper by Mostovoy a theory is presented…