Data for Origin of skyrmion lattice phase splitting in Zn-substituted Cu2OSeO3

FIG. 3: (a) Magnetization M vs T for polycrystalline samples, measured in a magnetic field of 25 mT. (b) The same for single crystal samples. (c) The temperature derivative of the M vs. T for polycrystalline samples, revealing multiple magnetic transitions.

(open circles: experientially obtained data, blue, orange and green dotted lines: fits to distinct magnetic phases.) (d) The temperature derivative of the M vs T single crystal data, showing a single transition. FIG. 4: (Top) Critical temperature Tc (crosses) and lattice parameter a (circles) for each Cu2OSeO3 phase in polycrystalline samples, as a function of Zn-substitution. (Bottom) Volume fractions of each distinct phase in polycrystalline samples extracted from X-ray and DC magnetometry data.

FIG. 5: (a)-(d) Real component of AC susceptibility ¬chi at a frequency of 10 Hz and driving field of 0.3 mT as a function of field B and temperature T for polycrystalline samples, showing the paramagnetic (P), ferrimagnetic (F), conical (C), helical (H) and skyrmion lattice (S) phases. (e)-(h). The same, but for single crystal samples.

FIG. 6:(a) LF muSR spectra for 6.4% Zn-substituted polycrystalline Cu2OSeO3 measured at 54 K in 18 mT on a logarithmic scale with the background subtracted. Lines are guides to the eye. Relaxation rate lambda for LF muSR measurements of (b) pristine, (c) 6.4% and (d) 10.5% Zn-substituted Cu2OSeO3.

Shaded regions indicate the location of the SkL phase derived from AC susceptibility.