Magnetic cations doped into a double perovskite semiconductor

Abstract

We report two solid solutions based on the magnetic ion doping of the double perovskite oxide Sr₂GaSbO₆: Sr₂Ga_1−xCr_xSbO₆ (0.1 ≤ x ≤ 0.4) and Sr₂Ga_1−xFe_xSbO₆ (0.1 ≤ x ≤ 0.4). All compositions crystallize in the same space group (I4/m) as their undoped parent phase Sr₂GaSbO₆, with the trivalent magnetic cations Cr³⁺ or Fe³⁺ partially substituting for non-magnetic Ga³⁺ in one of the B-cation sites. The Cr- and Fe-doped phases display dominant antiferromagnetic coupling among the dopant magnetic moments, and exhibit decreasing band gaps with increasing substitution level.