Critical scaling in the cubic helimagnet Cu2OSeO3


We present a detailed ac susceptibility investigation of the fluctuation regime in the insulating cubic helimagnet Cu2OSeO3. For magnetic fields μ0H 200 mT, and over a wide temperature (T ) range, the system behaves according to the scaling relations characteristic of the classical three-dimensional Heisenberg model. For lower magnetic fields, the scaling is preserved only at higher T and becomes renormalized in a narrow-T range above the transition temperature. Contrary to the well-studied case of MnSi, where the renormalization has been interpreted within the Brazovskii theory, our analysis of the renormalization at H = 0 shows the fluctuation regime in Cu2OSeO3 to lie closer to that expected within the Wilson-Fischer scenario.

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@inproceedings{ivkovi2014CriticalSI, title={Critical scaling in the cubic helimagnet Cu2OSeO3}, author={Ivica Živkovi{\'c} and Jeffrey S. White and Henrik M. R\onnow and Krunoslav Pr{\vs}a and H. Berger}, year={2014} }