Slight Co-doping tuned magnetic and electric properties on cubic BaFeO3 single crystal

Abstract

The single crystal of cubic perovskite BaFeO3 shows multiple magnetic transitions and external stimulus sensitive magnetism. In this paper, a 5%-Co-doped BaFeO3 (i.e. BaFe0.95Co0.05O3) single crystal was grown by combining floating zone methods with high-pressure techniques. Such a slight Co doping has little effect on crystal structure, but significantly changes the magnetism from the parent antiferromagnetic ground state to a ferromagnetic one with the Curie temperature T C ≈ 120 K. Compared with the parent BaFeO3 at the induced ferromagnetic state, the saturated magnetic moment of the doped BaFe0.95Co0.05O3 increases by about 10% and reaches 3.64 μ B/f.u. Resistivity and specific heat measurements show that the ferromagnetic ordering favors metallic-like electrical transport behavior for BaFe0.95Co0.05O3. The present work indicates that Co-doping is an effective method to tune the magnetic and electric properties for the cubic perovskite phase of BaFeO3.