MnGe and CoGe with the cubic B20 structure were synthesized at 4-5.5 GPa and 600-1000°C for 1-3 hr using the belt-type high-pressure apparatus. Both MnGe and CoGe are antiferromagnetic with Néel temperatures of 197 and 120 K, respectively. One expects an electron transfer of 0.7 electron from germanium to transition metal in these compounds. The anomalous temperature dependences of the electrical resistivity, the thermoelectric power, and the magnetic susceptibility of MnGe and CoGe are due to a "temperature-induced local moment.".
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Condensed Matter Physics
- Physical and Theoretical Chemistry
- Inorganic Chemistry
- Materials Chemistry