Observation of spin-glass behavior in 1111-type magnetic semiconductor (La, Ba)(Zn, Mn)SbO

We report the successful fabrication of a new 1111-type bulk magnetic semiconductor (La,Ba)(Zn,Mn)SbO through the solid solution of (La,Ba) and (Zn,Mn) in the parent compound LaZnSbO. The polycrystalline samples (La,Ba)(Zn,Mn)SbO crystallize into ZrCuSiAs-type tetragonal structure, which has the same structure as iron-based superconductor LaFeAsO 1– δ . The DC magnetization measurements indicate the existence of spin-glass ordering, and the coercive field is up to ∼11500 Oe (1 Oe = 79.5775 A⋅m −1 ). The AC magnetic susceptibility further determines that the samples evolve into a conventional spin-glass ordering state below the spin freezing temperature T f . In addition, the negative magnetoresistance ( MR ≡ [ ρ ( H )– ρ (0)]/ ρ (0)) reaches −88% under 9 T.