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Giant improper ferroelectricity in the ferroaxial magnet CaMn7O12
R. D. Johnson, L. C. Chapon, D. D. Khalyavin +3
In rhombohedral CaMn7O12, an improper ferroelectric polarization of magnitude 2870 μC m-2 is induced by an incommensurate helical magnetic structure that evolves below TN1 = 90 K.…
Cu3Nb2O8: a multiferroic with chiral coupling to the crystal structure
R. D. Johnson, Sunil Nair, L. C. Chapon +5
By combining bulk properties, neutron diffraction and non-resonant X-ray diffraction measurements, we demonstrate that the new multiferroic CuNbO becomes polar simultan…
Spin dynamics in the S =1/2 kagome compound vesignieite, Cu3Ba(VO5H)2
Ross H Colman, Fabrice Bert, David Boldrin +5
We report the study of high quality samples of the frustrated S = 1/2 kagome antiferromagnet vesignieite, Cu3Ba(VO5H)2. Neutron powder diffraction measurements evidence the high qu…
Unconventional Multiferroicity in Cupric Oxide
Pierre Toledano, Naemi Leo, Dmitry D. Khalyavin +4
The magnetic phase transitions reported below 230 K in cupric oxide are analyzed theoretically at the macroscopic and microscopic levels. The incommensurate multiferroic and lock-i…