Entropic signatures of the skyrmion lattice phase in MnSi1–xAlx and Fe1–yCoySi
| Autor: | John Ditusa, Chetan Dhital |
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| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Physical Review B. 102 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.102.224408 |
| Popis: | The entropic signatures of magnetic phase transitions in the skyrmion lattice host compounds $\mathrm{Mn}{\mathrm{Si}}_{0.962}{\mathrm{Al}}_{0.038}$ and ${\mathrm{Fe}}_{0.7}{\mathrm{Co}}_{0.3}\mathrm{Si}$ were investigated through low field magnetization and ac susceptibility measurements. These data indicate that the conical to skyrmion transition that occurs with the application of magnetic field in $\mathrm{Mn}{\mathrm{Si}}_{0.962}{\mathrm{Al}}_{0.038}$ is characterized by clear discontinuity in the magnetic entropy as expected for first order topological phase transition. These same magnetoentropic features are negligibly small in isostructural ${\mathrm{Fe}}_{0.7}{\mathrm{Co}}_{0.3}\mathrm{Si}$ due to the level of chemical substitution related disorder and differences in the spin dynamics (range and timescales). Despite the obvious similarities in the magnetic structures of these two compounds, the transitions between these phases is substantially different indicating a surprising nonuniversality to the magnetic phase transitions in this class of materials. |
| Databáze: | OpenAIRE |
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