Entropic signatures of the skyrmion lattice phase in MnSi1-xAlx and Fe1-yCoySi
- Kennesaw State Univ., Marietta, GA (United States)
- Louisiana State Univ., Baton Rouge, LA (United States); Indiana Univ.-Purdue Univ. Indianapolis (IUPUI), Indianapolis, IN (United States)
Here, the entropic signatures of magnetic phase transitions in the skyrmion lattice host compounds MnSi0.962Al0.038 and Fe0.7Co0.3Si 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 MnSi0.962Al0.038 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 Fe0.7Co0.3Si 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.
- Research Organization:
- Louisiana State Univ., Baton Rouge, LA (United States); Kennesaw State Univ., Marietta, GA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC); National Science Foundation (NSF); Louisiana Board of Regents; State of Florida
- Grant/Contract Number:
- SC0012432; DMR-1644779
- OSTI ID:
- 1851619
- Journal Information:
- Physical Review. B, Vol. 102, Issue 22; ISSN 2469-9950
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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