Magnetic relaxation phenomena in Cu2OSeO3 and phase diagram
Abstract
We present an investigation of the magnetic field-temperature phase diagram of Cu2OSeO3 based on DC magnetisation and AC susceptibility measurements covering a broad frequency range of four orders of magnitude, from very low frequencies reaching 0.1 Hz up to 1 kHz. The experiments were performed in the vicinity of TC=58.2 K and around the skyrmion lattice A-phase. At the borders between the different phases the characteristic relaxation times reach several milliseconds and the relaxation is non-exponential. Consequently the borders between the different phases depend on the specific criteria and frequency used and an unambiguous determination is not possible.
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