Metamagnetic transition, magnetocaloric effect and electronic structure of the rare-earth anti-perovskite SnOEu3

Guillou, F.; Paudyal, D.; Mudryk, Y.; Pathak, A. K.; Smetana, V.; Mudring, A. -V.; Pecharsky, V. K.

doi:10.1016/j.jmmm.2020.166405

Title: Metamagnetic transition, magnetocaloric effect and electronic structure of the rare-earth anti-perovskite SnOEu₃

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Abstract

Rare-earth anti-perovskites with oxygen are an interesting magnetic materials family at the boundary between intermetallics and oxides, however they remain largely unexplored. Here, magnetic and heat capacity investigations, as well as density functional theory (DFT) calculations, were carried out on SnOEu₃. At low magnetic field (B ≤ 0.5 T), a Néel temperature separates antiferromagnetic and paramagnetic phases at 31 K. When applying higher magnetic field below the Néel temperature, successive transformations toward a ferromagnetic state via a number of intermediate canted magnetic structures are observed and are associated with only modest latent heat and transition entropy. High-pressure magnetic measurements confirm the stable divalent state of Eu up to 1.05 GPa. A direct magnetocaloric effect progressively increases with applied magnetic field above the Néel temperature, reaching -16 J kg^–1 K^-1 for ΔB = 7 T. On the other hand, the inverse magnetocaloric effect of the field-induced transition below T_N saturates at ~+5 J kg^-1 K^-1. DFT calculations support magnetic instabilities observed experimentally in SnOEu₃ and reveal an unusual exchange mechanism and band topology near the Fermi level.

Authors:

Guillou, F. ^[1]; Paudyal, D. ^[2]; Mudryk, Y. ^[2]; Pathak, A. K. ^[3]; Smetana, V. ^[4]; Mudring, A. -V. ^[4]; Pecharsky, V. K. ^[5]

Ames Lab., Ames, IA (United States); Inner Mongolia Normal Univ., Hohhot (China)
Ames Lab., Ames, IA (United States)
Ames Lab., Ames, IA (United States); State Univ. of New York (SUNY), Buffalo, NY (United States)
Stockholm Univ. (Sweden)
Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States)

Publication Date:: Tue Jan 07 00:00:00 EST 2020

Research Org.:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:: 1591616

Alternate Identifier(s):: OSTI ID: 1592527

Report Number(s):: IS-J-10131
Journal ID: ISSN 0304-8853

Grant/Contract Number:: DEAC02-07CH11358

Resource Type:: Accepted Manuscript

Journal Name:: Journal of Magnetism and Magnetic Materials

Additional Journal Information:: Journal Volume: 501; Journal Issue: C; Journal ID: ISSN 0304-8853

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE

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                    Guillou, F., Paudyal, D., Mudryk, Y., Pathak, A. K., Smetana, V., Mudring, A. -V., and Pecharsky, V. K. Metamagnetic transition, magnetocaloric effect and electronic structure of the rare-earth anti-perovskite SnOEu3.  United States: N. p., 2020. 
Web.  doi:10.1016/j.jmmm.2020.166405.

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                    Guillou, F., Paudyal, D., Mudryk, Y., Pathak, A. K., Smetana, V., Mudring, A. -V., & Pecharsky, V. K. Metamagnetic transition, magnetocaloric effect and electronic structure of the rare-earth anti-perovskite SnOEu3.  United States.  https://doi.org/10.1016/j.jmmm.2020.166405

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                    Guillou, F., Paudyal, D., Mudryk, Y., Pathak, A. K., Smetana, V., Mudring, A. -V., and Pecharsky, V. K. Tue .  
"Metamagnetic transition, magnetocaloric effect and electronic structure of the rare-earth anti-perovskite SnOEu3".  United States.  https://doi.org/10.1016/j.jmmm.2020.166405.  https://www.osti.gov/servlets/purl/1591616.

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@article{osti_1591616,

  title        = {Metamagnetic transition, magnetocaloric effect and electronic structure of the rare-earth anti-perovskite SnOEu3},

  author       = {Guillou, F. and Paudyal, D. and Mudryk, Y. and Pathak, A. K. and Smetana, V. and Mudring, A. -V. and Pecharsky, V. K.},

  abstractNote = {Rare-earth anti-perovskites with oxygen are an interesting magnetic materials family at the boundary between intermetallics and oxides, however they remain largely unexplored. Here, magnetic and heat capacity investigations, as well as density functional theory (DFT) calculations, were carried out on SnOEu3. At low magnetic field (B ≤ 0.5 T), a Néel temperature separates antiferromagnetic and paramagnetic phases at 31 K. When applying higher magnetic field below the Néel temperature, successive transformations toward a ferromagnetic state via a number of intermediate canted magnetic structures are observed and are associated with only modest latent heat and transition entropy. High-pressure magnetic measurements confirm the stable divalent state of Eu up to 1.05 GPa. A direct magnetocaloric effect progressively increases with applied magnetic field above the Néel temperature, reaching -16 J kg–1 K-1 for ΔB = 7 T. On the other hand, the inverse magnetocaloric effect of the field-induced transition below TN saturates at ~+5 J kg-1 K-1. DFT calculations support magnetic instabilities observed experimentally in SnOEu3 and reveal an unusual exchange mechanism and band topology near the Fermi level.},

  doi          = {10.1016/j.jmmm.2020.166405},

  journal      = {Journal of Magnetism and Magnetic Materials},

  number       = C,

  volume       = 501,

  place        = {United States},

  year         = {Tue Jan 07 00:00:00 EST 2020},

  month        = {Tue Jan 07 00:00:00 EST 2020}

}

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Title: Metamagnetic transition, magnetocaloric effect and electronic structure of the rare-earth anti-perovskite SnOEu3

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Title: Metamagnetic transition, magnetocaloric effect and electronic structure of the rare-earth anti-perovskite SnOEu₃