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

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.