Normal-state magnetoresistance of Sr2RuO4 single crystals

We have measured the normal-state magnetoresistance (MR) of superconducting Sr2RuO4 single crystals (T-c0 = 0.84 K) between 1.5 and 300 K in all magne tic fields up to 7.3 T. For in- and out-of-plane MR, Delta rho(ab) and Delt a rho(c), the current was applied in the ab plane and along the c axis, res pectively. In both cases, the magnetic field was perpendicular to the appli ed current. We found that both Delta rho(ab)(H)/rho(ab)(0) and Delta rho(c) (H)/p(c)(0) an positive at low temperatures and decrease in magnitude with increasing temperature, eventually changing their signs from positive to ne gative at a temperature T* approximate to 75 K. Further analysis indicates that, below T*, the magnetic field dependence of Delta rho(ab)(H)/rho(ab)(0 ) is different from that of Delta rho(c)(H)/rho(c) (0). (C) 1998 Elsevier S cience Ltd. All rights reserved.