Abstract
Magnetic and electrical properties of the hexagonal Th 7Fe 3-type R 7Rh 3 compounds (R=La, Ce, Pr and Nd) have been studied by measuring a.c. magnetic susceptibility, magnetization, electrical resistivity, thermoelectric power and thermal expansion for polycrystalline samples. The Ce 7Rh 3 and Pr 7Rh 3 show ferromagnetic ordering below 6.8 and 15.6 K, respectively. In Nd 7Rh 3, there are two magnetic ordered phases; the ferromagnetic phase below 11 K and the antiferromagnetic phase up to 32 K. In the antiferromagnetic phase, a metamagnetic transition takes place. Pronounced changes at the magnetic transitions are observed in thermoelectric power.
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