Formation and rotation of skyrmion crystal in the chiral-lattice insulator Cu 2 OSeO 3

  title={Formation and rotation of skyrmion crystal in the chiral-lattice insulator Cu 2 OSeO 3},
  author={Shinichiro Seki and J. -H. Kim and Dmytro S. Inosov and Robert Georgii and Bernhard Keimer and Shintaro Ishiwata and Yoshinori Tokura},
  journal={Physical Review B},
Small-angle neutron scattering experiments were performed on a bulk single crystal of chiral-lattice multiferroic insulator Cu${}_{2}$OSeO${}_{3}$. In the absence of an external magnetic field, helical spin order with magnetic modulation vector $q\ensuremath{\parallel}\ensuremath{\langle}001\ensuremath{\rangle}$ was identified. When a magnetic field is applied, a triple-$q$ magnetic structure emerges normal to the field in the A phase just below the magnetic ordering temperature ${T}_{c… 

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