Critical scaling in the cubic helimagnet Cu&lt;sub&gt;2&lt;/sub&gt;OSeO&lt;sub&gt;3&lt;/sub&gt;

Živković, I.; White, J.S.; Rønnow, H.M.; Prša, K.; Berger, H.

doi:10.1103/PhysRevB.89.060401

Critical scaling in the cubic helimagnet Cu₂OSeO₃

Živković I, White JS, Rønnow HM, Prša K & Berger H

Citation

Živković, I., White, J. S., Rønnow, H. M., Prša, K., & Berger, H. (2014). Critical scaling in the cubic helimagnet Cu₂OSeO₃. Physical Review B, 89(6), 060401 (5 pp.). https://doi.org/10.1103/PhysRevB.89.060401

Persistent URL https://www.dora.lib4ri.ch/psi/islandora/object/psi:9008

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.