Electronic and Magnetic Characterization of Doped Perovskite Stannate Epitaxial Thin Films*

La-doped BaSnO₃ thin films have been identified as a promising high mobility semiconducting oxide, which could play an important role in the development of an all-oxide power electronics platform. In order to incorporate spin functionality into these materials, we explore magnetic doping of the conducting perovskite stannates. We have fabricated La and Ru doped BaSnO₃ and SrSnO₃ films on (001) SrTiO₃ substrates grown by molecular beam epitaxy (MBE) and pulsed laser deposition (PLD). X-ray diffraction (XRD) was used to verify epitaxial growth and confirm high crystalline quality, with typical omega rocking curve FWHM of 0.05^o deg. Films are optically transparent as verified by UV-vis spectrometry. They are also conductive, with room temperature mobilities up to 105 cm²/Vs, and standard carrier electronconcentrations of 1-2x10²⁰ /cm³. Films show evidence of paramagnetism both in the field and temperature dependence of magnetization.