Some new ternary ferromagnets (abstract)

David J. Webb, Traci Y. Kuromoto, Susan M. Kauzlarich

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Abstract

A number of new ternary ferromagnetic compounds have been prepared1 which have the general formula A1 4MnX1 1 (A=Ca, Sr and X=As, Sb, or Bi) and are isostructural to the main group Zintl compounds Ca1 4GaAs1 1 (Ref. 2) and Ca1 4AlSb1 1.3 The Mn-Mn nearest-neighbor distances in these compounds are ≥11 Å. Each of the compounds containing Mn is a metallic ferromagnet with a Curie transition in the neighborhood of 40–60 K. From magnetization measurements in the paramagnetic regime it appears that the Mn has a valence of +3 and that there are good local moments associated with the four unpaired electrons. This is in contrast to the low-temperature state in which the ordered ferromagnetic moment is only about 2.5 μB/Mn. Since no structural change is found upon cooling the sample below the Curie temperature and resistivity measurements show a strong interaction between the conduction electrons and the local moments, we suggest that the ferromagnetic moment is reduced by coupling with the conduction electrons.

Original languageEnglish (US)
Pages (from-to)4825
Number of pages1
JournalJournal of Applied Physics
Volume69
Issue number8
DOIs
StatePublished - Apr 15 1991

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Webb, D. J., Kuromoto, T. Y., & Kauzlarich, S. M. (1991). Some new ternary ferromagnets (abstract). Journal of Applied Physics, 69(8), 4825. https://doi.org/10.1063/1.348244