(Ca,Na)(Zn,Mn)₂As₂: A new spin and charge doping decoupled diluted ferromagnetic semiconductor Available to Purchase

Here, we report the successful synthesis of a spin- and charge-decoupled diluted magnetic semiconductor (DMS) (Ca,Na)(Zn,Mn)₂As₂, crystallizing into the hexagonal CaAl₂Si₂ structure. The compound shows a ferromagnetic transition with a Curie temperature up to 33 K with 10% Na doping, which gives rise to carrier density of n_p ∼ 10²⁰cm⁻³. The new DMS is a soft magnetic material with H_C < 400 Oe. The anomalous Hall effect is observed below the ferromagnetic ordering temperature. With increasing Mn doping, ferromagnetic order is accompanied by an interaction between the local spin and mobile charge, giving rise to a minimum in resistivity at low temperatures and localizing the conduction electrons. The system provides an ideal platform for studying the interaction of the local spins and conduction electrons.