EuSe2: A novel antiferromagnetic rare-earth polychalcogenide

J. A. Cowen, P. Michlin, J. Kraus, S. D. Mahanti, J. A. Aitken, Mercouri G Kanatzidis

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Abstract

The reaction of Eu with a molten mixture of Li2Se and excess Se has produced a new rare earth dichalcogenide, EuSe2, with a type "a" antiferromagnetic structure. The compound crystallizes in the tetragonal space group I4/mcm forming into small single crystal rectangular blocks with their long axis along c. The high temperature magnetic susceptibility exhibits Curie-Weiss behavior with a ferromagnetic Θ = 15 ± 1 K and an effective moment μeff=7.9±0.1 Bohr magnetons consistent with the theoretical value of 7.94 for the Eu2+ free ion. There is a peak in χc at Tn = 8.0±0.5 K which is attributed to an antiferromagnetic transition. At T=2.5 K with the magnetic field, H, applied along c, M(H) exhibits a sharp increase near 1.5 T attributed to a metamagnetic transition. With H along a the moments saturate at about 5 T. A simple mean field model in which the Eu ions in the ab plane are coupled into ferromagnetic sheets, with alternate sheets along c coupled antiferromagnetically to form a bulk antiferromagnet is used to interpret the data.

Original languageEnglish
Pages (from-to)5381-5383
Number of pages3
JournalJournal of Applied Physics
Volume85
Issue number8 II B
Publication statusPublished - Apr 15 1999

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ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physics and Astronomy (miscellaneous)

Cite this

Cowen, J. A., Michlin, P., Kraus, J., Mahanti, S. D., Aitken, J. A., & Kanatzidis, M. G. (1999). EuSe2: A novel antiferromagnetic rare-earth polychalcogenide. Journal of Applied Physics, 85(8 II B), 5381-5383.