Magnetic ordering in Eu2In and Eu2Sn

Ritter, C.; Ryan, D. H.; Provino, A.; Lamura, G.; Mudryk, Y.; Chouhan, R. K.; Singh, P.; Johnson, D. D.; Pecharsky, V. K.; Manfrinetti, P.

doi:10.1016/j.jallcom.2024.173573

Title: Magnetic ordering in Eu₂In and Eu₂Sn

Journal Article · Thu Jan 18 00:00:00 EST 2024 · Journal of Alloys and Compounds

DOI:https://doi.org/10.1016/j.jallcom.2024.173573· OSTI ID:2282318

Ritter, C. ^[1]; Ryan, D. H. ^[2]; Provino, A. ^[3]; Lamura, G. ^[4]; Mudryk, Y. ^[5]; Chouhan, R. K. ^[5]; Singh, P. ^[5]; Johnson, D. D. ^[5]; Pecharsky, V. K. ^[5]; Manfrinetti, P. ^[3]

Inst. Laue-Langevin (ILL), Grenoble (France)
McGill Univ., Montreal, QC (Canada)
Univ. of Genova (Italy); Ames Lab., and Iowa State Univ., Ames, IA (United States); National Research Council (CNR), Genova (Italy). Inst. for Superconductors, Innovative Materials and Devices (CNR-SPIN)
Iowa State Univ., Ames, IA (United States)
Ames Lab., and Iowa State Univ., Ames, IA (United States)

Eu₂In and Eu₂Sn crystallize in the orthorhombic Co₂Si-type structure (oP12, Pnma, No. 62) with In and Sn atoms occupying one 4c site and the Eu atoms filling two other 4c sites. Eu₂In has a nearly ideal first-order magnetostructural transition (FOMT) at 55 K with a hysteresis of less than 0.1 K, a large entropy change and an adiabatic temperature change of 5.0 K in a field of 2 T. The anhysteretic nature of the FOMT is likely due to there being no change in cell symmetry and relatively small changes in the lattice parameters. There is no magnetostructural transition in Eu2Sn. In this work we present the results of powder neutron diffraction, magnetization, and Eu Mössbauer spectroscopy aimed to investigate the nature of magnetic order for both Eu₂In and Eu₂Sn. The Eu Mössbauer spectrum of Eu₂In at 5 K shows two equal area components, consistent with Eu occupying two equal multiplicity crystallographic sites. However, the different hyperfine fields (B) of 27 T and 17 T suggest that the magnetic environments of the Eu moments on the two 4c sites are different. Neutron diffraction data at 2.5 K show that in Eu₂In the order is ferromagnetic, with Eu moments on both Eu sites oriented parallel to the a-axis; moment values of 6.8 μB and 6.5 μB were found. For Eu₂Sn measurements find two antiferromagnetic transitions, which are corroborated by neutron diffraction. Analysis of density-functional theory calculations shows negligible energy difference between differing magnetic configurations, indirectly supporting stability of multiple magnetic structures observed experimentally. While the transition at T_N1 = 30 K corresponds to the formation of a simple k₁ = 0 antiferromagnetic structure with Eu-moments pointing along the b-axis, at T_N2 = 13 K a coexisting second magnetic order with k₂ = [0, ½, ½] appears.

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Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 2282318

Report Number(s):: IS-J-11,246

Journal Information:: Journal of Alloys and Compounds, Vol. 980; ISSN 0925-8388

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
Eu2In
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Neutron diffraction
Magnetic structure
Ferromagnetism

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Title: Magnetic ordering in Eu₂In and Eu₂Sn