EFFECT OF MANGANESE ON MAGNETIC AND ELECTRICAL PROPERTIES OF THE RMnxT12-x ALLOYS

W. Suskia,b, K. Wochowskia, T. Mydlarzb and B. Belanc aW. Trzebiatowski Institute of Low Temperature and Structure Research Polish Academy of Sciences, P.O. Box 1410, 50-950 Wroc³aw 2, Poland bInternational Laboratory of High Magnetic Fields and Low Temperatures 53-421 Wroc³aw, Poland cDepartment of Inorganic Chemistry, Ivan Franko National University of L'viv 790005 L'viv, Ukraine Devoted to memory of late E. Leyarovsky

The magnetic and electrical properties of the tetragonal, ThMn12-type RMnxT12-x alloys (R = Y, Ce, Pr, Nd, Sm and T = Fe, Co, Ni) were studied in broad temperature and magnetic field ranges to elucidate an influence of manganese on the magnetic ordering in these materials. Magnetic properties were examined at T=1.7-300K in magnetic field up to 14T, whereas the electrical properties were examined at T=4.2-300K, on the polycrystalline samples. Majority of the samples exhibit ferro- or ferrimagnetic properties. Some samples containing larger concentration of Mn are paramagnetic in the whole temperature range. The electrical resistivity of these alloys shows metallic character.

PACS numbers: 75.20.-g, 75.20.En, 75.50.Ee, 75.50.Gg