Effect of manganese on magnetic and electrical properties of the RMnxT12-xalloys

The magnetic and electrical properties of the tetragonal, ThMn12-type RMnxT 12-x alloys (R = Y, Ce, Pr, Nd, Sm and T = Fe, Co, Ni) were studied in broa d temperature and magnetic field ranges to elucidate an influence of mangan ese on the magnetic ordering in these materials. Magnetic properties were e xamined at T = 1.7-300 K in magnetic field up to 14 T, whereas the electric al properties were examined at T = 4.2-300 K, on the polycrystalline sample s. Majority of the samples exhibit ferro- or ferrimagnetic properties. Some samples containing larger concentration of Mn are paramagnetic in the whol e temperature range. The electrical resistivity of these alloys shows metal lic character.