LARGE MAGNETORESISTANCE OF THE FERROMAGNETIC INTERMETALLICS URHSI ANDURHGE

URhSi and URhGe have been studied by means of magnetization and magnet oresistance measurements. These compounds undergo a magnetic phase tra nsition into the ferromagnetic state at 9.5 and 9.0 K, respectively. A large magnetoresistance near their Curie temperature is observed. At B = 8 T, the maximum magnetoresistance is -36% at 10.3 K for URhSi and -40% at 9.5 K for URhGe. We propose that this large magnetoresistance is a consequence of two kinds of scattering: the spin-disorder scatte ring and scattering from magnetic polarons.