MAGNETIC-STRUCTURE AND PROPERTIES OF EQUIATOMIC RARE-EARTH GERMANIDES

Magnetic measurements were made on the compounds EuGe, DyGe and TmGe. The first two compounds order antiferromagnetically at 20 K and 37 K respectively. For TmGe antiferromagnetic ordering is observed below 4. 2 K. The magnetic structure of orthorhombic DyGe was investigated by neutron diffraction and shown to be antiferromagnetic with propagation vector k equals left bracket 00 one-half right bracket . The magnetic properties of all RGe compounds (R EQUVLNT rare earth metal) are reviewed. It is shown that the magnetic coupling constant changes from positive to negative as the RGe series is passed through.