The magnetic structures of RTi2Ga4 (R= Er, Ho and Dy)
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Date
2018-01-31
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Australian Institute of Physics
Abstract
The first study of magnetism in the RTi2Ga4 system was reported by Ghosh et al. in 1993 [1] who observed unusual magnetic behaviour, leading them to conclude that these compounds exhibit the effects of mixed Ferro/Antiferromagnetic exchange, possibly with spin-glass behaviour. Interestingly, they observed a rather rapid increase in coercivity with decreasing temperature. In 2001, Abe et al. [2] studied a single-crystal of ErTi2Ga4 and showed that this compound is a ferromagnet oriented along the [100] direction, with quite
strong magnetic anisotropy. We have carried out high-resolution neutron diffraction measurements to determine
the magnetic and crystal structural parameters and magnetic ordering temperatures of the RTi2Ga4 (R=Er, Ho and Dy) compounds. These compounds crystallise in the tetragonal YbMo2Al4-type structure with the I4/mmm (#139) space group. These compounds are confirmed to be ferromagnetic. The Dy and Ho magnetic moments order within the tetragonal basal plane whereas the ordering of the Er moments is along the c-axis.
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Keywords
Magnetic materials, Titanium, Gallium, Erbium, Holmium, Dysprosium, Ferromagnetic materials, Spin glass state, Crystals, Diffraction, Magnetic moments
Citation
Saad, H., Hutchinson, W. D., Hester, J. R., & Cadogan, J. M. (2018). The magnetic structures of RTi2Ga4 (R= Er, Ho and Dy). Poster presented to the 42nd Annual Condensed Matter and Materials Meeting, Charles Sturt University, Wagga Wagga, NSW, 30th January – 2nd February, 2018. (pp. 71). Retrieved from: https://physics.org.au/wp-content/uploads/cmm/2018/Wagga_2018_Conference_Handbook.pdf