Entropic signatures of the skyrmion lattice phase in MnSi1-xAlx and Fe1-yCoySi

Dhital, C.; DiTusa, J. F.

doi:10.1103/physrevb.102.224408

Title: Entropic signatures of the skyrmion lattice phase in MnSi_1-xAl_x and Fe_1-yCo_ySi

Journal Article · Wed Dec 09 00:00:00 EST 2020 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.102.224408· OSTI ID:1851619

^[1]; DiTusa, J. F. ^[2]

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 MnSi_0.962Al_0.038 and Fe_0.7Co_0.3Si 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 MnSi_0.962Al_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 Fe_0.7Co_0.3Si 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.

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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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Title: Entropic signatures of the skyrmion lattice phase in MnSi1-xAlx and Fe1-yCoySi

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References (37)

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Title: Entropic signatures of the skyrmion lattice phase in MnSi_1-xAl_x and Fe_1-yCo_ySi