Study of the transport and magnetic properties of substituted Ba(Fe1-xNix)2(Se1-yTey)3

The magnetic order in BaFe2Se3, an iron-based spin ladder that is superconducting under pressure, is intensely studied due to the intimate relation between magnetism and superconductivity. In the present paper, we have performed a comprehensive study of structural, magnetic, and electronic properties on Ba(Fe1-xNix)2Se3 (0 x 0.2) and BaFe2(Se1-yTey)3 (0 y 0.15). Neutron powder diffraction measurements were performed on the Ni-doped sample up to x = 0.1 and BaFe2(Se0.85Te0.15)3. Our results show that the block magnetic order remains as the ground state for x 0.05 in Ba(Fe1-xNix)2Se3. Additionally, for BaFe2(Se0.85Te0.15)3, the block magnetic structure is even more robust. As for the resistivity, it decreases with increasing Ni content while it barely changes with Te doping. The observed negligible change of the magnetic propagation wave vector as a function of Ni content seems to contradict the orbital selective Mott Phase proposed previously.