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Valence and magnetic transitions in YbMn2Si2-xGex

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Abstract.

A series of YbMn2Si2-xGex compounds (x=0, 0.4, 1.0, 1.4, 2.0) with the tetragonal ThCr2Si2-type structure was investigated using neutron powder diffraction. The behaviour of YbMn2Si2-xGex with x<∼1.4 is consistent with magnetic structures similar to that of YbMn2Si2 – predominant collinear antiferromagnetism of the Mn sublattice at high temperatures, with antiferromagnetic ordering of the Yb ions at ∼1.5 K. The results also reveal a change in the Yb valence state from YbMn2Si2 to YbMn2Ge2 with the transition taking place above a critical concentration, xc∼1.4. YbMn2Si2 is trivalent, whereas analysis of the unit cell volumes leads to a Yb valence of about 2.35 in YbMn2Ge2.

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Authors and Affiliations

  1. Hahn-Meitner-Institut, BENSC, Glienicker Strasse 100, 14109 Berlin, Germany, , , , , , DE

    M. Hofmann

  2. School of Physics, University College, Australian Defence Force Academy, The University of New South Wales, Canberra, ACT 2600, Australia, , , , , , AU

    S.J. Campbell & A.V.J. Edge

Authors
  1. M. Hofmann
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  2. S.J. Campbell
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  3. A.V.J. Edge
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Received: 18 July 2001 / Accepted: 24 October 2001

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ID="*"Corresponding author. (Fax: +44-1235/445720, E-mail: M.Hofmann@rl.ac.uk) Present address: Rutherford Appleton Laboratory, ISIS, Chilton, Didcot, OX11 0QX, UK

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Hofmann, M., Campbell, S. & Edge, A. Valence and magnetic transitions in YbMn2Si2-xGex . Appl Phys A 74 (Suppl 1), s713–s715 (2002). https://doi.org/10.1007/s003390101147

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  • DOI: https://doi.org/10.1007/s003390101147

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