Magnetic and Transport Properties of TbAg1-xInx Compounds

Measurements of the magnetization, electrical resistivity, transverse magnetoresistance and Hall effect have been made on the polycrystals of TbAg 1- x In x compounds. The Neel temperature T N has the minimum around x =0.3 where the magnetic structure changes from (ππ0) to (00π) mode. The ordinary Hall coefficient R 0 is positive for all the compounds and has the minimum around x =0.3. The spontaneous Hall coefficient R s is positive in silver rich region and decreases with increasing x and changes its sign at about x =0.1. The transverse magnetoresistance is proportional to square of the field. The results are discussed on the basis of the two band model. It is deduced that the number of conduction electrons is about 3×10 -4 per unit cell and that of holes is 0.71 for x =0 and 0.33 for x =0.5, decreasing with increasing x . The magnetic phase of this system is discussed on the basis of simple RKKY model.