Long-wavelength helimagnetic order and skyrmion lattice phase in Cu 2OSeO 3

T. Adams; A. Chacon; M. Wagner; A. Bauer; G. Brandl; B. Pedersen; H. Berger; P. Lemmens; C. Pfleiderer

doi:10.1103/PhysRevLett.108.237204

Long-wavelength helimagnetic order and skyrmion lattice phase in Cu ₂OSeO ₃

T. Adams, A. Chacon, M. Wagner, A. Bauer, G. Brandl, B. Pedersen, H. Berger, P. Lemmens, C. Pfleiderer

Chair of Experimental Physics on the Topology of Correlated Systems

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387 Scopus citations

Abstract

We report a long-wavelength helimagnetic superstructure in bulk samples of the ferrimagnetic insulator Cu ₂OSeO ₃. The magnetic phase diagram associated with the helimagnetic modulation inferred from small-angle neutron scattering and magnetization measurements includes a skyrmion lattice phase and is strongly reminiscent of MnSi, FeGe, and Fe _1-xCo _xSi, i.e., binary isostructural siblings of Cu ₂OSeO ₃ that order helimagnetically. The temperature dependence of the specific heat of Cu ₂OSeO ₃ is characteristic of nearly critical spin fluctuations at the helimagnetic transition. This provides putative evidence for effective spin currents as the origin of enhancements of the magnetodielectric response instead of atomic displacements considered so far.

Original language	English
Article number	237204
Journal	Physical Review Letters
Volume	108
Issue number	23
DOIs	https://doi.org/10.1103/PhysRevLett.108.237204
State	Published - 8 Jun 2012

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10.1103/PhysRevLett.108.237204

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title = "Long-wavelength helimagnetic order and skyrmion lattice phase in Cu 2OSeO 3 ",

abstract = "We report a long-wavelength helimagnetic superstructure in bulk samples of the ferrimagnetic insulator Cu 2OSeO 3. The magnetic phase diagram associated with the helimagnetic modulation inferred from small-angle neutron scattering and magnetization measurements includes a skyrmion lattice phase and is strongly reminiscent of MnSi, FeGe, and Fe 1-xCo xSi, i.e., binary isostructural siblings of Cu 2OSeO 3 that order helimagnetically. The temperature dependence of the specific heat of Cu 2OSeO 3 is characteristic of nearly critical spin fluctuations at the helimagnetic transition. This provides putative evidence for effective spin currents as the origin of enhancements of the magnetodielectric response instead of atomic displacements considered so far.",

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T1 - Long-wavelength helimagnetic order and skyrmion lattice phase in Cu 2OSeO 3

AU - Adams, T.

AU - Chacon, A.

AU - Wagner, M.

AU - Bauer, A.

AU - Brandl, G.

AU - Pedersen, B.

AU - Berger, H.

AU - Lemmens, P.

AU - Pfleiderer, C.

PY - 2012/6/8

Y1 - 2012/6/8

N2 - We report a long-wavelength helimagnetic superstructure in bulk samples of the ferrimagnetic insulator Cu 2OSeO 3. The magnetic phase diagram associated with the helimagnetic modulation inferred from small-angle neutron scattering and magnetization measurements includes a skyrmion lattice phase and is strongly reminiscent of MnSi, FeGe, and Fe 1-xCo xSi, i.e., binary isostructural siblings of Cu 2OSeO 3 that order helimagnetically. The temperature dependence of the specific heat of Cu 2OSeO 3 is characteristic of nearly critical spin fluctuations at the helimagnetic transition. This provides putative evidence for effective spin currents as the origin of enhancements of the magnetodielectric response instead of atomic displacements considered so far.

AB - We report a long-wavelength helimagnetic superstructure in bulk samples of the ferrimagnetic insulator Cu 2OSeO 3. The magnetic phase diagram associated with the helimagnetic modulation inferred from small-angle neutron scattering and magnetization measurements includes a skyrmion lattice phase and is strongly reminiscent of MnSi, FeGe, and Fe 1-xCo xSi, i.e., binary isostructural siblings of Cu 2OSeO 3 that order helimagnetically. The temperature dependence of the specific heat of Cu 2OSeO 3 is characteristic of nearly critical spin fluctuations at the helimagnetic transition. This provides putative evidence for effective spin currents as the origin of enhancements of the magnetodielectric response instead of atomic displacements considered so far.

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Long-wavelength helimagnetic order and skyrmion lattice phase in Cu ₂OSeO ₃

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