Magnetoresistance of Sr2RuO4 under high magnetic fields parallel to the conducting plane

The interplane resistivity rho(c) and in-plane resistivity rho(ab) of the l ayeredsuperconductor Sr2RuO4 were studied at 50 mK under magnetic fields B up to 33 T applied parallel to the conducting plane. The superconductivity recurrence predicted theoretically was not observed for either rho(c) or rh o(ab) inmagnetic fields up to 33 T. In the normal-state transverse magnetor esistance of rho(c), a pronounced anisotropy was found within the conductin g plane. A sharp resistance peak with an apex in the direction of the paral lel field and a superlinear field dependence at the peak were observed with a magnetic field in the [110] direction, while this peak was absent with a magnetic field parallel to the [100] direction. The results are discussed in terms of the in-plane anisotropy of the interplane transfer energy t(c). For rho(ab), the longitudinal magnetoresistance with the current both in t he [110] and [100] directions increased notably, which is incompatible with semiclassical behavior.