Thermodynamic evidence of a second skyrmion lattice phase and tilted conical phase in Cu 2 OSeO 3
| Autor: | W. Simeth, Lukas Heinen, Helmuth Berger, Achim Rosch, Markus Garst, Sebastian Mühlbauer, Andreas Bauer, A. Chacon, M. Halder, Christian Pfleiderer |
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| Jazyk: | angličtina |
| Předmět: |
Physics
Condensed matter physics Skyrmion Demagnetizing field 02 engineering and technology Conical surface 021001 nanoscience & nanotechnology Magnetocrystalline anisotropy 01 natural sciences Magnetic field Magnetization 0103 physical sciences 010306 general physics 0210 nano-technology Anisotropy Critical field |
| Zdroj: | Physical Review B |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.98.144429 |
| Popis: | Precision measurements of the magnetization and ac susceptibility of Cu2OSeO3 are reported for magnetic fields along different crystallographic directions, focusing on the border between the conical and the field-polarized state for a magnetic field along the axis, complemented by selected specific heat data. Clear signatures of the emergence of a second skyrmion phase and a tilted conical phase are observed, as recently identified by means of small angle neutron scattering. The low-temperature skyrmion phase displays strongly hysteretic phase boundaries, but no dissipative effects. In contrast, the tilted conical phase is accompanied by strong dissipation and higher-harmonic contributions, while the transition fields are essentially nonhysteretic. The formation of the second skyrmion phase and tilted conical phase are found to be insensitive to a vanishing demagnetization factor. A quantitative estimate of the temperature dependence of the magnetocrystalline anisotropy may be consistently inferred from the magnetization and the upper critical field and agrees well with a stabilization of the low-temperature skyrmion phase and tilted conical state by conventional cubic magnetic anisotropies. |
| Databáze: | OpenAIRE |
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