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• W3037283363 abstract "We report a small-angle neutron scattering study of the helical and skyrmion lattice order in single-crystal ${mathrm{Cu}}_{2}{mathrm{OSeO}}_{3}$ under quasihydrostatic helium gas pressures up to 5 kbar. By using helium gas as the pressure-transmitting medium (PTM) we ensure pressure application with improved hydrostaticity at cryogenic temperatures compared with previous reports where liquid PTMs were used. For 5-kbar He gas pressure we observe modest changes of the ambient pressure phase diagram; the critical temperature ${T}_{c}$ changes by $+2.8$(2)%, while in the low-$T$ limit the helical propagation vector $|q|$ changes by $ensuremath{-}0.5(2)%$, the lower critical field ${H}_{c1}$ changes by $+2.5$(1.0)%, and the upper critical field ${H}_{c2}$ remains unchanged within uncertainty. The skyrmion phase also changes little under pressure; its largest $T$ extent varies from ${T}_{c}ensuremath{-}2.5(5)$ K at ambient pressure to ${T}_{c}ensuremath{-}3.0(5)$ K at 5 kbar, and its location in the phase diagram follows the pressure-driven shift of ${T}_{c}$. The weak pressure dependences of the critical magnetic fields and skyrmion phase contrast strongly with much stronger pressure-driven changes reported from previous quasihydrostatic pressure studies. Taking into account the present results and those of other uniaxial pressure data, we suggest that the results of previous quasihydrostatic pressure studies were influenced by inadvertent directional stress pressure components. Overall, our study represents a high-pressure study of the chiral magnetism in ${mathrm{Cu}}_{2}{mathrm{OSeO}}_{3}$ under the most hydrostatic high-pressure conditions to date and serves also as a salient reminder of the sensitivity of chiral magnets to deviations from hydrostaticity in quasihydrostatic high-pressure studies." @default.
• W3037283363 created "2020-07-02" @default.
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• W3037283363 date "2020-06-22" @default.
• W3037283363 modified "2023-10-15" @default.
• W3037283363 title "In situ control of the helical and skyrmion phases in Cu2OSeO3 using high-pressure helium gas up to 5 kbar" @default.
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• W3037283363 doi "https://doi.org/10.1103/physrevb.101.214435" @default.
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