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

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Štefančič, Aleš, Moody, S.H., Hicken, T.J., Birch, M. T., Balakrishnan, Geetha, Barnett, S. A., Crisanti, Marta, Evans, J. S. O., Holt, S. J. R., Franke, K. J. A., Hatton, P. D., Huddart, B. M., Lees, Martin R., Pratt, F. L., Tang, C. C., Wilson, M. N., Xiao, F. and Lancaster, T. (2018) Data for Origin of skyrmion lattice phase splitting in Zn-substituted Cu2OSeO3. [Dataset]

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Abstract

We present an investigation into the structural and magnetic properties of Zn-substituted Cu2OSeO3, 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 behavior. No such multiphase behavior is observed in single crystal samples.

Item Type: Dataset
Subjects: Q Science > QC Physics
Divisions: Faculty of Science > Physics
Type of Data: Text file describing the data
Library of Congress Subject Headings (LCSH): Skyrme model, Magnetic materials, Ferromagnetic materials, Topological dynamics, Zinc
Publisher: Physics, University of Warwick
Official Date: 12 October 2018
Dates:
DateEvent
12 October 2018Accepted
Collection date:
Date fromDate to
1 January 20171 May 2018
Status: Not Peer Reviewed
Publication Status: Published
Media of Output: .txt
Access rights to Published version: Restricted or Subscription Access
Copyright Holders: University of Warwick
Description:

FIG. 2:

Powder X-ray diraction peak at 2 theta = 96:65 deg. for polycrystalline samples with different Zn concentrations. Open circles: experimental data; dashed lines: single peak fits for individual phases; gray solid line: a sum of these fits; red line: difference between the global fit and the data. This demonstrates that the asymmetrical shape and splitting of diffraction peaks can only be modelled by multiple phases.

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.

RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
EP/N032128/1[EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
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