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Quintuplet Condensation in the Skyrmionic Insulator Cu_{2}OSeO_{3} at Ultrahigh Magnetic Fields
T Nomura1, I Rousochatzakis2, O Janson3
1Shizuoka University, Department of Physics, Shizuoka 422-8529, Japan.
None:
We report ultrahigh magnetic field Faraday rotation results on the chiral helimagnet Cu_{2}OSeO_{3}, the first Mott insulator showing skyrmion lattice phases and a linear magnetoelectric effect. Between 180 and 300 T, we find signatures of a Bose-Einstein condensation of magnons, which can be described as a canted XY ferrimagnet. Because of the magnetoelectric coupling, the transverse magnetic order of the individual Cu^{2+} spins is accompanied by a characteristic domelike electric polarization which is crucial for the observation of the condensate via the Faraday rotation effect.
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