Structural changes upon magnetic ordering in magnetocaloric AlFe2B2

Oey, Yuzki M.; Bocarsly, Joshua D.; Mann, Dallas; Levin, Emily E.; Shatruk, Michael; Seshadri, Ram

doi:10.1063/5.0007266

Title: Structural changes upon magnetic ordering in magnetocaloric AlFe₂B₂

Abstract

With a Curie temperature just above room temperature, AlFe₂B₂ is a useful magnetocaloric material composed of earth-abundant elements. Here, we employ temperature-dependent high-resolution synchrotron X-ray diffraction to establish with high certainty that the paramagnetic to ferromagnetic transition in AlFe₂B₂ is of second order, showing no discontinuity in lattice parameters or cell volume. Nevertheless, the lattice parameters undergo anisotropic changes across the transition with distinct differences in the thermal expansion coefficients. While the $$a$$ and $$b$$ lattice parameters show a positive thermal expansion, $$c$$ shows a negative thermal expansion. We link these changes to the respective interatomic distances to determine the contribution of magnetism to the anisotropic structural evolution. The work underpins the possible role of magnetostructural coupling in driving the magnetocaloric effect in AlFe₂B₂.

Authors:

^[1];

^[1]; Mann, Dallas ^[2];

^[1];

^[2];

^[1]

Univ. of California, Santa Barbara, CA (United States)
Florida State Univ., Tallahassee, FL (United States)

Publication Date:: 2020-03-27

Research Org.:: Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

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

OSTI Identifier:: 1648364

Alternate Identifier(s):: OSTI ID: 1630979

Grant/Contract Number:: AC02-06CH11357; DGE-1650114

Resource Type:: Accepted Manuscript

Journal Name:: Applied Physics Letters

Additional Journal Information:: Journal Volume: 116; Journal Issue: 21; Journal ID: ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)

Country of Publication:: United States

Language:: ENGLISH

Subject:: 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Magnetic hysteresis; Magnetic materials; Crystal lattices; Thermal effects; Density functional theory; Magnetic ordering; Synchrotron X-ray diffraction; Phase transitions; Entropy

Citation Formats


                    Oey, Yuzki M., Bocarsly, Joshua D., Mann, Dallas, Levin, Emily E., Shatruk, Michael, and Seshadri, Ram. Structural changes upon magnetic ordering in magnetocaloric AlFe2B2.  United States: N. p., 2020. 
Web.  doi:10.1063/5.0007266.

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                    Oey, Yuzki M., Bocarsly, Joshua D., Mann, Dallas, Levin, Emily E., Shatruk, Michael, & Seshadri, Ram. Structural changes upon magnetic ordering in magnetocaloric AlFe2B2.  United States.  https://doi.org/10.1063/5.0007266

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                    Oey, Yuzki M., Bocarsly, Joshua D., Mann, Dallas, Levin, Emily E., Shatruk, Michael, and Seshadri, Ram. Fri .  
"Structural changes upon magnetic ordering in magnetocaloric AlFe2B2".  United States.  https://doi.org/10.1063/5.0007266.  https://www.osti.gov/servlets/purl/1648364.

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@article{osti_1648364,

  title        = {Structural changes upon magnetic ordering in magnetocaloric AlFe2B2},

  author       = {Oey, Yuzki M. and Bocarsly, Joshua D. and Mann, Dallas and Levin, Emily E. and Shatruk, Michael and Seshadri, Ram},

  abstractNote = {With a Curie temperature just above room temperature, AlFe2B2 is a useful magnetocaloric material composed of earth-abundant elements. Here, we employ temperature-dependent high-resolution synchrotron X-ray diffraction to establish with high certainty that the paramagnetic to ferromagnetic transition in AlFe2B2 is of second order, showing no discontinuity in lattice parameters or cell volume. Nevertheless, the lattice parameters undergo anisotropic changes across the transition with distinct differences in the thermal expansion coefficients. While the $a$ and $b$ lattice parameters show a positive thermal expansion, $c$ shows a negative thermal expansion. We link these changes to the respective interatomic distances to determine the contribution of magnetism to the anisotropic structural evolution. The work underpins the possible role of magnetostructural coupling in driving the magnetocaloric effect in AlFe2B2.},

  doi          = {10.1063/5.0007266},

  journal      = {Applied Physics Letters},

  number       = 21,

  volume       = 116,

  place        = {United States},

  year         = {2020},

  month        = {3}

}

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Title: Structural changes upon magnetic ordering in magnetocaloric AlFe2B2

Abstract

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Title: Structural changes upon magnetic ordering in magnetocaloric AlFe₂B₂

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