Effect of co-doping of donor and acceptor impurities in the ferromagnetic semiconductor Zn_<1-χ>Cr_χTe studied by softx-ray magnetic circular dichroism
Effect of co-doping of donor and acceptor impurities in the ferromagnetic semiconductor Zn_<1-χ>Cr_χTe studied by softx-ray magnetic circular dichroism
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软X射线圆磁二色性研究铁磁半导体Zn_<1-χ>Cr_χTe中施主和受主杂质共掺杂的影响
DOI：
10.1088/0953-8984/23/17/176002
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
S. Kuroda
中科院分区：
文献类型：
--
作者：
Y. Yamazaki;T. Kataoka;V. R. Singh;A. Fujimori;F.-H. Chang;D.-J. Huang;H.-J. Lin;C. T. Chen;K. Ishikawa;K. Zhang;S. Kuroda
我们对稀释铁磁半导体Zn 1− x Cr x Te掺杂碘（I）或氮（N）（分别对应于电子或空穴掺杂）进行了X射线吸收光谱（XAS）和X射线磁圆二色性（XMCD）研究。从XAS谱中Cr 2p吸收峰的形状可以推断，未掺杂、I掺杂和轻N掺杂样品中Cr离子均为二价（Cr2+），而重N掺杂样品中Cr2+和三价（Cr3+）共存。这一结果表明，掺杂的氮原子作为受体，但掺杂的空穴位于铬离子。在Cr2p吸收边处的XMCD信号的磁场依赖性中，在未掺杂、I掺杂和轻N掺杂的样品中观察到铁磁行为，而在重N掺杂的样品中，铁磁性被相当大地抑制，这与磁化测量的结果一致。
We have performed x-ray absorption spectroscopy (XAS) and x-ray magnetic circular dichroism (XMCD) studies of the diluted ferromagnetic semiconductor Zn 1− x Cr x Te doped with iodine (I) or nitrogen (N), corresponding to electron or hole doping, respectively. From the shape of the Cr 2p absorption peak in the XAS spectra, it was concluded that the Cr ions in the undoped, I-doped and lightly N-doped samples are divalent (Cr 2+), while Cr 2+ and trivalent (Cr 3+) coexist in the heavily N-doped sample. This result indicates that the doped nitrogen atoms act as acceptors but that doped holes are located on the Cr ions. In the magnetic field dependence of the XMCD signal at the Cr 2p absorption edge, ferromagnetic behaviors were observed in the undoped, I-doped, and lightly N-doped samples, while ferromagnetism was considerably suppressed in the heavily N-doped sample, which is consistent with the results of magnetization measurements.