Measurements of magnetoresistivity and magnetization of Sr2RuO4 single crystals

We report measurements of magnetoresistivity, de magnetization, and ac magnetic susceptibility on several single crystal samples of Sr2RuO4(T-c = similar to1 K). Niagnetoresistivity was measured in the temperature range 0.1 similar to 4K, and in applied magnetic fields up 6 tesla, The magnetic field and current were applied both parallel and perpendicular to the c-axis of the crystal. From the measurements, we determined the superconducting upper critical field, H(c)2(T). We observed that in magnetic fields above H(c)2, and for transport currents both in the abplane and along the c-axis, Sr2RuO4 exhibits a metallic resistivity down to 0.1 K. We have also studied the magnetic phase diagram by measuring de magnetization M(H) in the temperature range 0.4 similar to 2 K and in applied fields up to 60 mT along the c-axis of the crystal using a Faraday magnetometer. We discuss the resistively and magnetically determined superconducting phase diagrams along with ac susceptibility data.