Ferrimagnetism of the magnetoelectric compound<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>Cu</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mtext>OSeO</mml:mtext></mml:mrow><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>probed by<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mtext>S</mml:mtext><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>77

Belesi, M.; Rousochatzakis, Ioannis; Wu, Han; Berger, H.; Shvets, I. V.; Mila, Frédéric; Ansermet, Jean-Philippe

doi:10.1103/physrevb.82.094422

Cited by 78 publications

(99 citation statements)

References 32 publications

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“…Although these are not the exact tetrahedron basis states due to the presence of a finite triplet-quintet mixing (see methods section), this representation is qualitatively correct. This effective spin wavefunction is consistent with the experimental observation of a locally ferrimagnetic order parameter 20,21 . The quantum fluctuations ingrained into these triplet wavefunctions, however, give rise to a substantial reduction of the local moments (Table 2), pinpointing the origin of the small moments observed experimentally 20 .…”

Section: Resultssupporting

confidence: 75%

“…In the crystal structure of Cu 2 OSeO 3 , the Cu 2 þ atoms make up a three-dimensional network of corner-sharing tetrahedra ( Fig. 2b) with two inequivalent Cu sites, Cu(1) and Cu(2) featuring a different local environment: Cu(1)O 5 bipyramids and distorted Cu(2)O 4 plaquettes, respectively 20,21 . Each tetrahedron contains Cu(1) and Cu(2) in a ratio of 1:3.…”

Section: Resultsmentioning

confidence: 99%

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The quantum nature of skyrmions and half-skyrmions in Cu2OSeO3

et al. 2014

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The Skyrme-particle, the skyrmion, was introduced over half a century ago in the context of dense nuclear matter. But with skyrmions being mathematical objects-special types of topological solitons-they can emerge in much broader contexts. Recently skyrmions were observed in helimagnets, forming nanoscale spin-textures. Extending over length scales much larger than the interatomic spacing, they behave as large, classical objects, yet deep inside they are of quantum nature. Penetrating into their microscopic roots requires a multi-scale approach, spanning the full quantum to classical domain. Here, we achieve this for the first time in the skyrmionic Mott insulator Cu 2 OSeO 3 . We show that its magnetic building blocks are strongly fluctuating Cu 4 tetrahedra, spawning a continuum theory that culminates in 51 nm large skyrmions, in striking agreement with experiment. One of the further predictions that ensues is the temperature-dependent decay of skyrmions into half-skyrmions.

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Section: Resultssupporting

confidence: 75%

Section: Resultsmentioning

confidence: 99%

The quantum nature of skyrmions and half-skyrmions in Cu2OSeO3

et al. 2014

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“…Inequivalence of the copper sites and strong * Corresponding Author: cohn@physics.miami.edu magnetic interactions within tetrahedra lead to a 3-up-1-down, spin S = 1 magnetic state [13,14] that persists above the long-range magnetic ordering temperature [15,16]. Weaker interactions between tetrahedra lead to their ferromagnetic ordering below T C ≃ 58 K. Dzyaloshinsky-Moriya interactions induce a longwavelength, incommensurate helical spin structure and promote a Skyrmion lattice phase [17,18] near T C that has attracted considerable attention.…”

Section: Introductionmentioning

confidence: 99%

Ballistic magnon heat conduction and possible Poiseuille flow in the helimagnetic insulator Cu2OSeO3

et al. 2017

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We report on the observation of magnon thermal conductivity κm ∼ 70 W/mK near 5 K in the helimagnetic insulator Cu2OSeO3, exceeding that measured in any other ferromagnet by almost two orders of magnitude. Ballistic, boundary-limited transport for both magnons and phonons is established below 1 K, and Poiseuille flow of magnons is proposed to explain a magnon mean-free path substantially exceeding the specimen width for the least defective specimens in the range 2K < T < 10 K. These observations establish Cu2OSeO3 as a model system for studying longwavelength magnon dynamics.

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“…Cu 2 OSeO 3 is cubic in structure, with both trigonal bipyramidal CuO 5 and square pyramidal CuO 5 . The local magnetic ordering is primarily ferrimagnetic (T c = 60 K), with a net magnetization resulting from oppositely-oriented Cu spins with different oxygen bonding geometries [1,18,19]. Related to the insulating nature, and of interest for applications, Cu 2 OSeO 3 is multiferroic [1], with magnetic-field induced ferroelectricity that promises a unique approach to con- trol the skyrmion lattice.…”

mentioning

confidence: 99%