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dc.contributor.authorSusilo, RA-
dc.contributor.authorCadogan, JM-
dc.contributor.authorHutchison, WD-
dc.contributor.authorCampbell, SJ-
dc.contributor.authorAvdeev, M-
dc.contributor.authorRyan, DH-
dc.contributor.authorNamiki, T-
dc.identifier.citationSusilo, 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:
dc.description.abstractThe 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.en_US
dc.publisherAustralian Institute of Physicsen_US
dc.subjectThulium compoundsen_US
dc.subjectCrystal fielden_US
dc.subjectErbium compoundsen_US
dc.subjectExchange interactionsen_US
dc.subjectMagnetic momentsen_US
dc.subjectMagnetic propertiesen_US
dc.subjectMoessbauer effecten_US
dc.subjectNeel temperatureen_US
dc.subjectNeutron diffractionen_US
dc.subjectRare earthsen_US
dc.titleMagnetic ordering in Er2Fe2Si2C and Tm2Fe2Si2Cen_US
dc.typeConference Abstracten_US
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