Please use this identifier to cite or link to this item: https://apo.ansto.gov.au/dspace/handle/10238/11238
Title: Magnetic ordering in Er2Fe2Si2C and Tm2Fe2Si2C
Authors: Susilo, RA
Cadogan, JM
Hutchison, WD
Campbell, SJ
Avdeev, M
Ryan, DH
Namiki, T
Keywords: Antiferromagnetism
Thulium compounds
Crystal field
Erbium compounds
Exchange interactions
Magnetic moments
Magnetic properties
Moessbauer effect
Neel temperature
Neutron diffraction
Rare earths
Issue Date: Feb-2015
Publisher: Australian Institute of Physics
Citation: Susilo, R. A., Cadogan, J. M., Hutchison, W. D., Campbell, S. J., Avdeev, M., Ryan, D. H., & Namiki, T. (2015). Magnetic ordering in Er2Fe2Si2C and Tm2Fe2Si2C. Paper presented at 39th Annual Condensed Matter and Materials Meeting, Charles Sturt University, Wagga Wagga, NSW, 3 – 6 February 2015. Retrieved from: https://physics.org.au/wp-content/uploads/cmm/2015/Wagga2015_10_Handbook.pdf
Abstract: The magnetic ordering of two members of the R2Fe2Si2C (R = rare-earth) series of compounds (monoclinic Dy2Fe2Si2C-type structure with the C2/m space group), Er2Fe2Si2C and Tm2Fe2Si2C, have been studied by neutron powder diffraction and 166Er Mössbauer spectroscopy, complemented by magnetisation and specific heat measurements. In both cases, antiferromagnetic ordering of the R sublattice is observed, with Neel temperatures of 4.8(2) K and 2.6(3) K for Er2Fe2Si2C and Tm2Fe2Si2C, respectively. The magnetic structures of the Erand Tm-based compounds are quite different from those found for the other members of the R2Fe2Si2C series. Previous studies show that the common magnetic structure of the heavy- R2Fe2Si2C compounds involves ordering of the R sublattice along the b-axis with a propagation vector k = [0, 0, ½]. However, the antiferromagnetic structure of the Er sublattice in Er2Fe2Si2C is described by k = [½, ½, 0] with the Er magnetic moments lying close to the ac-plane. Tm2Fe2Si2C is found to exhibit a more complex magnetic structure that is characterised by a square-wave modulation of the Tm magnetic moments along the a-axis and a cell-doubling along the b-axis with k = [0.403(1), ½, 0]. The differences in the magnetic structures of these compounds are interpreted in terms of the RKKY exchange interaction, which depends on the R-R interatomic distances, and crystal field effects acting on the R3+ ions.
URI: https://apo.ansto.gov.au/dspace/handle/10238/11238
ISBN: 978-0-646-59459-0;
Appears in Collections:Conference Publications

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