Origin of skyrmion lattice phase splitting in Zn-substituted Cu$_{2}$OSeO$_{3}$
A. \v{S}tefan\v{c}i\v{c}, S. Moody, T.J. Hicken, T.M. Birch, G., Balakrishnan, S.A. Barnett, M. Crisanti, J.S.O. Evans, S.J.R. Holt, K.J.A., Franke, P.D. Hatton, B.M. Huddart, M.R. Lees, F.L. Pratt, C.C. Tang, M.N., Wilson, F. Xiao, T. Lancaster
TL;DR
This study investigates how Zn substitution affects the skyrmion lattice phase in Cu2OSeO3, revealing phase splitting in polycrystals due to multiple coexisting Zn-rich phases, but not in single crystals.
Contribution
It demonstrates that skyrmion lattice phase splitting is linked to multiphase coexistence in polycrystalline samples, not intrinsic to the material.
Findings
SkL phase splitting occurs only in polycrystalline samples.
Multiphase coexistence explains the phase splitting.
Single crystals do not show phase splitting.
Abstract
We present an investigation into the structural and magnetic properties of Zn-substituted CuOSeO, a system in which the skyrmion lattice (SkL) phase in the magnetic field-temperature phase diagram was previously seen to split as a function of increasing Zn concentration. We find that splitting of the SkL is only observed in polycrystalline samples and reflects the occurrence of several coexisting phases with different Zn content, each distinguished by different magnetic behaviour. No such multiphase behaviour is observed in single crystal samples.
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