| Abstract: | Mössbauer experiments on Cu2FeGeS4 have shown that the ground orbital level of the Fe2+ ions is |Lz=0>, which corresponds to the existence of an easy plane of magnetization perpendicular to the tetragonal axis 0z; in the antiferromagnetic phase the magnetic moments actually lie inside this plane. The tetragonal splitting of the ground orbital doublet 3 is found to be about 1430 cm?1, and the Néel temperature is 12,3±0,3 K. A. self consistent calculation of molecular field is used to explain the order of magnitude of the hyperfine field observed at low temperature (Hhf=167±2 kOe at 4,2 K). |
