Magnetization and 55Mn Hyperfine Field in RMn2 (R = Rare Earth) Intermetallic Compounds

  • S. K. Malik
  • S. K. Dhar
  • R. Vijayaraghavan
  • K. Shimizu
  • W. E. Wallace

Abstract

The RMn2 (R = rare earth) compounds show some interesting crystallographic features. The compounds with R = Gd, Tb and Dy have the cubic Laves phase (C15 type) structure (1), those with Nd (2), Er, Tm (3) and Lu crystallize in hexagonal Laves phase (C14 type) structure, while PrMn2 has β-Mn type structure (4). The compounds SmMn2 (5) and HoMn2 (6) occur in either the C14 or C15 type structure. The compounds for R = La, Ce, Eu and Yb are not known to exist. As noted earlier (3,7), the change in lattice parameter over the RMn2 series is more rapid than that in the corresponding Fe, Co and Ni series. This may be taken to imply that the Mn valence (and hence its magnetic moment) changes across the series. We have carried out magnetization studies on GdMn2, DyMn2 and HoMn2 and 55Mn hyperfine field measurements on several RMn2 compounds to obtain information about the Mn ion moment. We find that the Mn moment is non-zero in cubic Laves phase RMn2 compounds, decreases in going from GdMn2 to DyMn2 and becomes zero or nearly so in cubic HoMn2 as well as in hexagonal Laves phase compounds.

Keywords

Argon Hexagonal Olated GdMn 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    K. Nassau, L. V. Cherry and W. E. Wallace, J. Phys. & Chem. Solids 16 123 (1960).CrossRefGoogle Scholar
  2. 2.
    H. R. Kirchmayr, Z. Angew. Phys. 27 18 (1969).Google Scholar
  3. 3.
    J. H. Wernick and S..E. Haszko, J. Phys. Chem. Solids 18 207 (1961).CrossRefGoogle Scholar
  4. 4.
    H. Oesterreicher, J. Less-Common Metals 23 7 (1971).CrossRefGoogle Scholar
  5. 5.
    Quoted by H. R. Kirchmayr and Carl A. Poldy in “Handbook of Physics and Chemistry of Rare Earths,” Karl A. Gschneidner and LeRoy Eyring, eds.. Vol. No. 2, p. 55 (1979).Google Scholar
  6. 6.
    S. K. Malik and W. E. Wallace, unpublished work.Google Scholar
  7. 7.
    S. K. Malik and W. E. Wallace, J. of Mag. and Mag. Materials, accepted for publication.Google Scholar
  8. 8.
    See, for example, W. E. Wallace, Rare Earth Intermetallics, Academic Press, Inc., New York, 1973, chapters 10 and 11.Google Scholar
  9. 9.
    S. Hirosawa, T. Tsuchida and Y. Nakamura, J. Phys. Soc. Jap. 47 804 (1979).CrossRefGoogle Scholar
  10. 10.
    G. P. Felcher, L. M. Corliss and J. M. Hastings, J. Appl. Phys. 36 1001 (1965).CrossRefGoogle Scholar

Copyright information

© Plenum Press, New York 1982

Authors and Affiliations

  • S. K. Malik
    • 1
  • S. K. Dhar
    • 1
  • R. Vijayaraghavan
    • 1
  • K. Shimizu
    • 2
  • W. E. Wallace
    • 3
  1. 1.Tata Institute of Fundamental ResearchBombayIndia
  2. 2.Toyama UniversityGofukuJapan
  3. 3.Department of ChemistryUniversity of PittsburghPittsburghUSA

Personalised recommendations