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

Journal Article · Fri Mar 27 00:00:00 EDT 2020 · Applied Physics Letters

DOI:https://doi.org/10.1063/5.0007266· OSTI ID:1648364

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

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.

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

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

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

OSTI ID:: 1648364

Alternate ID(s):: OSTI ID: 1630979

Journal Information:: Applied Physics Letters, Vol. 116, Issue 21; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: ENGLISH

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Cited by: 11 works

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