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

Abstract

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 LaFeAsO1–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.