Abstract
We have studied the crystal structure, magnetic structure and magnetic properties of the tetragonal compound DyTiGe by means of neutron-diffraction and magnetic measurements. The neutron diffraction measurements were made in the range 1.7–240 K and showed that DyTiGe has an antiferromagnetic structure with a propagation vector q =(0, 0, 0.5). The Dy moments have a preferred moment direction along the tetragonal axis at all temperatures in the magnetically ordered regime. The magnetic measurements showed that a forced ferromagnetic alignment of the Dy moments can be reached at 5 K in applied fields larger than 20 T. This ferromagnetic alignment is reached via two field-induced transitions at critical fields of 9.5 and 17.5 T. The lower critical field is strongly temperature dependent and becomes close to 2 T near the ordering temperature. The maximum magnetic-entropy change at T N in a field change from 0 to 5 T is very low and does not exceed 2 J/kg K.
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