Origin of skyrmion lattice phase splitting in Zn-substituted<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Cu</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>OSeO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>

Štefančič, Aleš; Moody, S. H.; Hicken, T. J.; Birch, M. T.; Balakrishnan, G.; Barnett, Sarah A.; Crisanti, M.; Evans, John S. O.; Holt, Samuel; Franke, Kévin J. A.; Hatton, P. D.; Huddart, B. M.; Lees, Martin R.; Pratt, F. L.; Tang, Chiu C.; Wilson, M. N.; Fan, Xing; Lancaster, Tom

doi:10.1103/physrevmaterials.2.111402

Cited by 26 publications

(29 citation statements)

References 36 publications

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“…entropic effects arising from the non-magnetic substitution 32 , which may also explain the long formation times. However, it is also possible that Zn substitution does not change the skyrmion formation physics, and it is simply a reduction of the lower boundary of the skyrmion region from 55.5 K in pristine Cu 2 OSeO 3 to 52.5 K in our Zn substituted sample 31 that lengthens the formation time. Extrapolating our zero electric field data to 55.5 K, we would expect a formation time of 2.1 +4.6 −0.9 ns, which is too short to observe with SANS.…”

Section: Resultsmentioning

confidence: 95%

“…Recently, crystals of (Cu 1−x Zn x ) 2 OSeO 3 (x = 0 to 0.024) have been grown and shown to host similar skyrmion phases to pristine Cu 2 OSeO 3 , but at temperatures shifted slightly lower as the Zn substitution level is increased 31 . Notably, the lifetime of metastable skyrmions in Zn substituted crystals is dramatically enhanced compared to that seen in pristine Cu 2 OSeO 3 .…”

Section: Introductionmentioning

confidence: 99%

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Measuring the formation energy barrier of skyrmions in zinc-substituted Cu2OSeO3

Wilson

Crisanti

et al. 2019

Phys. Rev. B

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We report small angle neutron scattering (SANS) measurements of the skyrmion lattice in (Cu0.976Zn0.024)2OSeO3 under the application of an electric field. These measurements show an expansion of the skyrmion lattice stability region with electric field. Furthermore, using time-resolved SANS, we observe the slow formation of skyrmions after an electric or magnetic field is applied, which has not been observed in pristine Cu2OSeO3 crystals. The measured formation times are dramatically longer than the corresponding skyrmion annihilation times after the external field is removed, and increase exponentially from 100 s at 52.5 K to 10,000 s at 51.5 K. This thermally activated behavior indicates an energy barrier for skyrmion formation of 1.57(2) eV, the size of which demonstrates the huge cost for creating these complex chiral objects. arXiv:1901.11508v3 [cond-mat.str-el]

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Section: Resultsmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Measuring the formation energy barrier of skyrmions in zinc-substituted Cu2OSeO3

Wilson

Crisanti

et al. 2019

Phys. Rev. B

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“…A single crystal of Cu 2 OSeO 3 was grown from pre-reacted polycrystalline powder using chemical vapour transport with TeCl 4 as a transporting agent (Details can be found in the supplemental information of Ref. [38]). An FEI Helios nano lab dual-beam was used to prepare 200 nm thick lamellae with lateral dimensions of 4 x 6 µm in [100] and [110] orientations.…”

Section: Experiments Detailsmentioning

confidence: 99%

Stability and metastability of skyrmions in thin lamellae ofCu2OSeO3

Wilson

Birch

Štefančič

et al. 2020

Phys. Rev. Research

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We report small angle X-ray scattering (SAXS) measurements of the skyrmion lattice in two 200 nm thick Cu2OSeO3 lamellae aligned with the applied magnetic field parallel to the out of plane [110] or [100] crystallographic directions. Our measurements show that the equilibrium skyrmion phase in both samples is expanded significantly compared to bulk crystals, existing between approximately 30 and 50 K over a wide region of magnetic field. This skyrmion state is elliptically distorted at low fields for the [110] sample, and symmetric for the [100] sample, possibly due to crystalline anisotropy becoming more important at this sample thickness than it is in bulk samples. Furthermore, we find that a metastable skyrmion state can be observed at low temperature by field cooling through the equilibrium skyrmion pocket in both samples. In contrast to the behavior in bulk samples, the volume fraction of metastable skyrmions does not significantly depend on cooling rate. We show that a possible explanation for this is the change in the lowest temperature of the skyrmion state in this lamellae compared to bulk, without requiring different energetics of the skyrmion state. arXiv:1909.07855v1 [cond-mat.str-el]

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Section: Introductionmentioning

confidence: 99%

“…It has further been shown that the position of the skyrmion pocket can be tuned through controlled chemical substitution [33][34][35]. In Cu 2 OSeO 3 , the substitution of Cu ions with nonmagnetic Zn ions led to a shift of the whole phase diagram towards lower temperatures [33]. On the other hand, magnetic doping with Ni induced an increase of the size of the skyrmion pocket towards lower temperatures with increasing Ni substitution, reported for polycrystalline samples studied with both ac susceptibility [34] and SANS [35].…”

Section: Introductionmentioning

confidence: 99%