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Title: Spin-reorientation in quaternary Dy_2Fe_2Si_2C
Authors: Susilo, RA
Cadogan, JM
Hutchison, WD
Stewart, GA
Campbell, SJ
Avdeev, M
Keywords: Anisotropy
Crystal field
Crystal lattices
Electron temperature
Magnetic properties
Moessbauer effect
Neutron diffraction
Spin orientation
Temperature dependence
Issue Date: 30-Nov-2016
Publisher: Australian Institute of Nuclear Science and Engineering
Citation: Susilo, R. A., Cadogan, J. M., Hutchison, W. D., Stewart, G. A., Campbell, S. J., & Avdeev, M. (2016). Spin-reorientation in quaternary Dy_2Fe_2Si_2C. Paper presented at 13th AINSE-ANBUG Neutron Scattering Symposium (AANSS 2016); Sydney, NSW, Australia, 29-30 November 2016.
Abstract: The low temperature magnetic properties of Dy_2Fe_2Si_2C have been investigated by magnetisation, specific heat, neutron powder diffraction and "5"7Fe Mössbauer spectroscopy measurements. In contrast to other R_2Fe_2Si_2C compounds, we found that Dy_2Fe_2Si_2C undergoes two successive magnetic transitions at low temperatures. The first magnetic transition at T_N = 26(2) K is associated with the transition from paramagnetic to antiferromagnetic states, whereas our neutron diffraction and "5"7Fe Mössbauer spectroscopy studies reveal that the second magnetic transition at T_t = 6(2) K is likely related to a spin-reorientation of the Dy moments rather than the independent ordering of the Fe sublattice. The magnetic structure above T_t can be described with a propagation vector k = [0 0 1/2] with the ordering of the Dy magnetic moments along the monoclinic b-axis, whereas on cooling below T_t the Dy moment tips away from the b-axis towards the ac-plane. Magnetocrystalline anisotropy energy calculations show that a canted magnetic structure is more energetically favourable below T_t than b-axis order due to the important influence of higher-order crystal field terms at low temperatures, thus explaining the unique occurrence of spin reorientation in Dy_2Fe_2Si_2C compared with other R_2Fe_2Si_2C compounds.
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