Magnetoresistance and Hall effect in e-doped superconducting SrLaCuO thin films

Abstract

We have epitaxially grown c-axis oriented SrxLa 1-xCuO2 thin films by rf sputtering on KTaO3 substrates with χ 0.12. The as-grown deposits are insulating and a series of superconducting films with various Tc(ρ=0) up to 26 K have been obtained by in-situ oxygen reduction. Transport measurements in the ab plane of these samples have been undertaken. We report original results on the temperature dependence of the Hall effect and on the anisotropic magnetoresistance (T ≥ Tc). We discuss the magnitude of upper critical fields and anisotropy, the Hall effect, which presents changes of sign indicative of the existence of two types of carriers, the normal state magnetoresistance, negative in parallel magnetic field, a possible signature of spin scattering. These properties are compared to those of hole-doped cuprates, such as BiSr(La)CuO with comparable Tc. © 2009 IOP Publishing Ltd.