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Title: Magnetic ordering in Eu2In and Eu2Sn

Abstract

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 bothmore » 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 TN1 = 30 K corresponds to the formation of a simple k1 = 0 antiferromagnetic structure with Eu-moments pointing along the b-axis, at TN2 = 13 K a coexisting second magnetic order with k2 = [0, ½, ½] appears.« less

Authors:
 [1];  [2];  [3];  [4];  [5];  [5];  [5];  [5];  [5];  [3]
+ Show Author Affiliations
  1. Inst. Laue-Langevin (ILL), Grenoble (France)
  2. McGill Univ., Montreal, QC (Canada)
  3. 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)
  4. Iowa State Univ., Ames, IA (United States)
  5. Ames Lab., and Iowa State Univ., Ames, IA (United States)
Publication Date:
Research Org.:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)
OSTI Identifier:
2282318
Report Number(s):
IS-J-11,246
Journal ID: ISSN 0925-8388
Grant/Contract Number:  
AC02-07CH11358
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Alloys and Compounds
Additional Journal Information:
Journal Volume: 980; Journal ID: ISSN 0925-8388
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Eu2In; Eu2Sn; Mössbauer spectroscopy; Neutron diffraction; Magnetic structure; Ferromagnetism

Citation Formats

Ritter, C., Ryan, D. H., Provino, A., Lamura, G., Mudryk, Y., Chouhan, R. K., Singh, P., Johnson, D. D., Pecharsky, V. K., and Manfrinetti, P. Magnetic ordering in Eu2In and Eu2Sn. United States: N. p., 2024. Web. doi:10.1016/j.jallcom.2024.173573.
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Ritter, C., Ryan, D. H., Provino, A., Lamura, G., Mudryk, Y., Chouhan, R. K., Singh, P., Johnson, D. D., Pecharsky, V. K., & Manfrinetti, P. Magnetic ordering in Eu2In and Eu2Sn. United States. https://doi.org/10.1016/j.jallcom.2024.173573
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Ritter, C., Ryan, D. H., Provino, A., Lamura, G., Mudryk, Y., Chouhan, R. K., Singh, P., Johnson, D. D., Pecharsky, V. K., and Manfrinetti, P. Thu . "Magnetic ordering in Eu2In and Eu2Sn". United States. https://doi.org/10.1016/j.jallcom.2024.173573.
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@article{osti_2282318,
title = {Magnetic ordering in Eu2In and Eu2Sn},
author = {Ritter, C. and Ryan, D. H. and Provino, A. and Lamura, G. and Mudryk, Y. and Chouhan, R. K. and Singh, P. and Johnson, D. D. and Pecharsky, V. K. and Manfrinetti, P.},
abstractNote = {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 TN1 = 30 K corresponds to the formation of a simple k1 = 0 antiferromagnetic structure with Eu-moments pointing along the b-axis, at TN2 = 13 K a coexisting second magnetic order with k2 = [0, ½, ½] appears.},
doi = {10.1016/j.jallcom.2024.173573},
journal = {Journal of Alloys and Compounds},
number = ,
volume = 980,
place = {United States},
year = {Thu Jan 18 00:00:00 EST 2024},
month = {Thu Jan 18 00:00:00 EST 2024}
}
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