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

(Ca,Na)(Zn,Mn)2As2: A new spin and charge doping decoupled diluted ferromagnetic semiconductor
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(Ca,Na)(Zn,Mn)2As2:一种新型自旋和电荷掺杂解耦稀铁磁半导体

DOI:
10.1063/1.4899190
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发表时间:
2014-10
影响因子:
3.2
通讯作者:
Changqing Jin
Changqing Jin
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
J. Munevar;G.M. Zhang;Y.J. Uemura;Changqing Jin

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在这里,我们报告的自旋和电荷解耦的稀磁半导体(DMS)(Ca,Na)(Zn,Mn)2As 2的成功合成,结晶成六方CaAl 2Si 2结构。该化合物显示出铁磁转变,居里温度高达33 K,掺杂10% Na,导致载流子密度为np <$1020 cm−3。新DMS是一种软磁材料,HC < 400 Oe。在铁磁有序温度以下观察到反常的霍尔效应。随着Mn掺杂的增加,铁磁有序伴随着局部自旋和移动的电荷之间的相互作用,在低温下引起电阻率的最小值并使传导电子局部化。该系统为研究局域自旋与传导电子的相互作用提供了一个理想的平台。
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 np ∼ 1020 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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发表时间: 2010-05-15
期刊: PHYSICAL REVIEW B
影响因子: 3.7
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