Magnetic resistivity in SrRuO3 and the ferromagnetic phase transition - art. no. 054435

We measured the resistivity of the itinerant ferromagnet SrRuO3 as a functi on of temperature (120 K < T < 180 K) and magnetic field (0 < H < 10 kOe) i n the vicinity of the ferromagnetic phase transition (T-c similar to 150 K) . We find that the magnetic resistivity rho (m) is related to the magnetiza tion M by rho (m)(M) = rho (m)(0) - aM(2) over a wide range of M. From the analysis of the resistivity data we determine the critical parameters of th e phase transition beta = 0.34+/-0.02, gamma = 1.14+/-0.07 below T-c, gamma = 1.17+/-0.14 above T-c, C+/C- similar to4. Here beta and gamma are the cr itical exponents of the spontaneous magnetization and the susceptibility, r espectively, and C+/C- is the amplitude ratio of the susceptibility. Our re sults are supported by a collapse of the magnetoresistance data on a single curve when an approriate scaling function is used.