Weak Crystallization of Fluctuating Skyrmion Textures in MnSi
| Autor: | A. Chacon, Markus Garst, J. Kindervater, Franz X. Haslbeck, Christian Pfleiderer, I. Stasinopoulos, Dirk Grundler, Christian Franz, Andreas Bauer, S. Mühlbauer, F. Rucker |
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| Rok vydání: | 2019 |
| Předmět: |
room-temperature
QC1-999 General Physics and Astronomy FOS: Physical sciences Neutron scattering 01 natural sciences 010305 fluids & plasmas law.invention state Paramagnetism Magnetization Condensed Matter - Strongly Correlated Electrons non-fermi-liquid law motion Lattice (order) 0103 physical sciences ddc:530 Crystallization 010306 general physics Spectroscopy lattice Physics Condensed Matter - Materials Science Condensed matter physics Strongly Correlated Electrons (cond-mat.str-el) Skyrmion Materials Science (cond-mat.mtrl-sci) dynamics stability Condensed Matter::Mesoscopic Systems and Quantum Hall Effect ddc magnetic phase-diagram Condensed Matter::Strongly Correlated Electrons Rotational spectroscopy transitions |
| Zdroj: | Physical Review X Physical Review X, Vol 9, Iss 4, p 041059 (2019) Physical review / X, 9 (4), Art. Nr.: 041059 |
| ISSN: | 2160-3308 0038-5646 0044-4510 |
| DOI: | 10.1103/physrevx.9.041059 |
| Popis: | We report an experimental study of the emergence of nontrivial topological winding and long-range order across the paramagnetic-to-skyrmion lattice transition in the transition metal helimagnet MnSi. Combining measurements of the susceptibility with small-angle neutron scattering, neutron-resonance spin-echo spectroscopy, and all-electrical microwave spectroscopy, we find evidence of skyrmion textures in the paramagnetic state exceeding 10(3) angstrom, with lifetimes above several 10(-9) s. Our experimental findings establish that the paramagnetic-to-skyrmion lattice transition in MnSi is well described by the Landau soft-mode mechanism of weak crystallization, originally proposed in the context of the liquid-to-crystal transition. As a key aspect of this theoretical model, the modulation vectors of periodic small-amplitude components of the magnetization form triangles that add to zero. In excellent agreement with our experimental findings, these triangles of the modulation vectors entail the presence of the nontrivial topological winding of skyrmions already in the paramagnetic state of MnSi when approaching the skyrmion lattice transition. |
| Databáze: | OpenAIRE |
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