(Ca,Na)(Zn,Mn)2As2: A new spin and charge doping decoupled diluted ferromagnetic semiconductor
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Here we report the successful synthesis of a spin- & charge-decoupled diluted
magnetic semiconductor (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 np~10^20 cm^-3. The new DMS is a soft magnetic material with HC<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.
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