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We present a detailed study of the phase diagram surrounding the skyrmionlattice (SkL) phase of Cu2OSe2O3 using high-precision magnetic acsusceptibility measurements. An extensive investigation of transition dynamicsaround the SkL phase using the imaginary component of the susceptibilityrevealed that at the conical-to-SkL transition a broad dissipation regionexists with a complex frequency dependence. The analysis of the observedbehavior within the SkL phase indicates a distribution of relaxation timesintrinsically related to SkL. At the SkL-to-paramagnet transition a narrowfirst-order peak is found that exhibits a strong frequency and magnetic fielddependence. Surprisingly, very similar dependence has been discovered for thefirst-order transition below the SkL phase, i.e. where the system enters thehelical and conical state(s), indicating similar processes across theorder-disorder transition.

Dissipation processes in the insulating skyrmion compound Cu2OSeO3