Structural, Electrical and Magnetic Properties of Solid Solution Films between SrRuO₃ and BaSnO₃

A series of SrRuO₃/BaSnO₃ solid solutions have been fabricated via laser molecular beam epitaxy. With the help of high-energy electron beam reflection, the ratio of SRO/BSO is precisely controlled in the scale of monolayer. The epitaxial relation was analyzed by x-ray diffraction and transmission electron microscopy. The lattice constants of c-axis varied with the change of the ratio between SRO and BSO, which is consistent with the results calculated by Vegard’s law. After successfully fabricate a series of SRO/BSO, temperature-dependent resistances measurement has been carried out. It was found that electrical behavior of SRO/BSO was varied from pure metallic to insulating while the ratio of BSO increased in the solid solutions. A metal-insulating transition can also be found in specific ratio. Further, the increase of BSO will result in an enlarged magnetoresistance in the solid solutions. In the magnetic hysteresis loops, the decrease in saturated magnetic moment, coercivity and the change in anisotropy can also be found. This experiment realizes an accurately control of solid solutions in the scale of monolayer. The structural, electrical and magnetic properties of SRO/BSOs have been systematically analyzed and the origin of these differences has also been discussed.