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

Abstract

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.

Authors:

^[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)

Publication Date:: Wed Dec 09 00:00:00 EST 2020

Research Org.:: Louisiana State Univ., Baton Rouge, LA (United States); Kennesaw State Univ., Marietta, GA (United States)

Sponsoring Org.:: USDOE Office of Science (SC); National Science Foundation (NSF); Louisiana Board of Regents; State of Florida

OSTI Identifier:: 1851619

Grant/Contract Number:: SC0012432; DMR-1644779

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review. B

Additional Journal Information:: Journal Volume: 102; Journal Issue: 22; Journal ID: ISSN 2469-9950

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 36 MATERIALS SCIENCE; magnetic phase transitions; magnet susceptibility; magnetic texture; skyrmions; spin state transition

Citation Formats


                    Dhital, C., and DiTusa, J. F. Entropic signatures of the skyrmion lattice phase in MnSi1-xAlx and Fe1-yCoySi.  United States: N. p., 2020. 
Web.  doi:10.1103/physrevb.102.224408.

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                    Dhital, C., & DiTusa, J. F. Entropic signatures of the skyrmion lattice phase in MnSi1-xAlx and Fe1-yCoySi.  United States.  https://doi.org/10.1103/physrevb.102.224408

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                    Dhital, C., and DiTusa, J. F. Wed .  
"Entropic signatures of the skyrmion lattice phase in MnSi1-xAlx and Fe1-yCoySi".  United States.  https://doi.org/10.1103/physrevb.102.224408.  https://www.osti.gov/servlets/purl/1851619.

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@article{osti_1851619,

  title        = {Entropic signatures of the skyrmion lattice phase in MnSi1-xAlx and Fe1-yCoySi},

  author       = {Dhital, C. and DiTusa, J. F.},

  abstractNote = {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.},

  doi          = {10.1103/physrevb.102.224408},

  journal      = {Physical Review. B},

  number       = 22,

  volume       = 102,

  place        = {United States},

  year         = {Wed Dec 09 00:00:00 EST 2020},

  month        = {Wed Dec 09 00:00:00 EST 2020}

}

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

Abstract

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