Role of critical fluctuations in the formation of a skyrmion lattice in MnSi
| Autor: | S. V. Grigor’ev, Ch. Dewhurst, E. V. Moskvin, Vadim Dyadkin, S. V. Maleev, N. M. Chubova |
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| Rok vydání: | 2017 |
| Předmět: |
Physics
Condensed matter physics Solid-state physics Skyrmion Neutron diffraction General Physics and Astronomy 02 engineering and technology Conical surface 021001 nanoscience & nanotechnology 01 natural sciences Magnetic field Lattice (order) 0103 physical sciences Wave vector 010306 general physics 0210 nano-technology Phase diagram |
| Zdroj: | Journal of Experimental and Theoretical Physics. 125:789-797 |
| ISSN: | 1090-6509 1063-7761 |
| DOI: | 10.1134/s1063776117100119 |
| Popis: | The region in the H–T phase diagram near the critical temperature (T c ) of the cubic helicoidal MnSi magnet is comprehensively studied by small-angle neutron diffraction. Magnetic field H is applied along the [111] axis. The experimental geometry is chosen to simultaneously observe the following three different magnetic states of the system: (a) critical fluctuations of a spin spiral with randomly orientated wavevector k f , (b) conical structure with k c ǁ H, and (c) hexagonal skyrmion lattice with ksk ⊥ H. Both states (conical structure, and skyrmion lattice) are shown to exist above critical temperature T c = 29 K against the background of the critical fluctuations of a spin spiral. The conical lattice is present up to the temperatures where fluctuation correlation length ξ becomes comparable with pitch of spiral d s . The skyrmion lattice is localized near T c and is related to the fluctuations of a spiral with correlation length ξ ≈ 2d s , and the propagation vector is normal to the field (ksk ⊥ H). These spiral fluctuations are assumed to be the defects that stabilize the skyrmion lattice and promote its formation. |
| Databáze: | OpenAIRE |
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