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Triangular antiferromagnetic order in the honeycomb layer lattice of \(\)

  • K.W. Krämer
  • H.U. Güdel
  • P. Fischer
  • F. Fauth
  • M.T. Fernandez-Diaz
  • T. Hauß

Abstract:

ErCl3 crystallizes in the AlCl3-type layer structure. The crystal structure was refined in the paramagnetic state by powder neutron diffraction. The monoclinic lattice parameters at 1.5 K are a = 6.8040(3)Å, b = 11.7456(5)Å, c = 6.3187(3)Å and \(\). The space group is C2/m. Short-range, predominantly in-plane, magnetic ordering occurs above 350 mK up to several Kelvin. Below \(\) mK a three-dimensional antiferromagnetic order with a propagation vector of \(\) sets in. The magnetic structure of ErCl3 was determined by powder and single-crystal neutron diffraction at temperatures down to 45 mK. The Er3+ ions are located on two-dimensional honeycomb layers in the ab plane. There are two antiferromagnetically coupled \(\) triangular sublattices which form right- and left-handed helices along the c-axis. The magnetic moments are oriented in the ab plane and amount to 3.3(1) \(\) at saturation. From the temperature dependence of the integrated neutron magnetic peak intensity a critical exponent \(\)(2) was derived for the magnetic phase transition.

PACS. 75.25.+z Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source x-ray scattering, etc.) - 75.40.-s Critical-point effects, specific heats, short-range order - 61.12.Ld Single-crystal and powder diffraction 

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Copyright information

© EDP Sciences, Springer-Verlag, Società Italiana di Fisica 2000

Authors and Affiliations

  • K.W. Krämer
    • 1
  • H.U. Güdel
    • 1
  • P. Fischer
    • 2
  • F. Fauth
    • 3
  • M.T. Fernandez-Diaz
    • 3
  • T. Hauß
    • 4
  1. 1.Department for Chemistry and Biochemistry, University of Bern, Freiestrasse 3, 3000 Bern 9, SwitzerlandCH
  2. 2.Laboratory for Neutron Scattering, Paul Scherrer Institute and ETH Zürich, 5232 Villigen PSI, SwitzerlandCH
  3. 3.Institut Laue-Langevin, BP 156, 38042 Grenoble Cedex 9, FranceFR
  4. 4.Hahn-Meitner Institute, Glienicker Strasse 100, 14109 Berlin, GermanyDE

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