Transition metal alloys and compounds;
Crystal growth;
Magnetization;
Phase transitions;
Magnetic measurements;
NEUTRON-DIFFRACTION;
REFINEMENT;
FE2GES4;
NUCLEAR;
D O I:
10.1016/j.jmmm.2019.166164
中图分类号:
T [工业技术];
学科分类号:
08 ;
摘要:
Single crystals of Mn2GeS4 were grown by chemical vapor transport. X-ray powder diffraction data show a single phase. Rietveld refinement results indicated that Mn2GeS4 crystalize in an olivine-type structure. The magnetic properties of the compound have been studied by means of DC magnetometry and AC susceptibility measurements. The system shows two different phase transitions on decreasing temperature, a first one at about 90 K, leading the system from the paramagnetic to an antiferromagnetic state and a second at about 25 K, corresponding to the onset of a weak ferromagnetic behavior superimposed to the underlying antiferromagnetic order. No evidence of a possible spin-glass behavior in the intermediate temperature region has been found.