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arXiv 1608.02684cond-mat.str-el
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稀磁半导体(Ba,K)(Zn,Mn)$_2$ As $_2$的局域原子和磁性结构

Local atomic and magnetic structure of dilute magnetic semiconductor (Ba,K)(Zn,Mn)$_2$As$_2$

Benjamin A. Frandsen, Zizhou Gong, Maxwell Terban, Soham Banerjee, Bijuan Chen, Changqing Jin, Mikhail Feygenson, Yasutomo J. Uemura, Simon J. L. Billinge

摘要:

通过对含温X射线和中子全散射数据的原子和磁对分布函数分析,研究了稀磁半导体系统(Ba,K)(Zn,Mn)$_2$ As $_2$的原子和磁结构.我们检测到的曲率变化的温度依赖性的平均tetraxite晶体结构的晶胞体积的温度与铁磁秩序的发病相一致。我们还观察到存在一个定义良好的本地正交结构上的短长度尺度的$\lesssim 5$的,导致在一个相当不对称的本地环境的Mn和As离子。最后,磁性PDF揭示了Mn自旋沿晶体学$c$轴的铁磁排列,具有甚至在铁磁有序温度以上存在的鲁棒最近邻铁磁相关性。我们讨论了这些结果的背景下,其他实验和理论研究这个系统。

英文摘要:

We have studied the atomic and magnetic structure of the dilute ferromagnetic semiconductor system (Ba,K)(Zn,Mn)$_2$As$_2$ through atomic and magnetic pair distribution function analysis of temperature-dependent x-ray and neutron total scattering data. We detected a change in curvature of the temperature-dependent unit cell volume of the average tetragonal crystallographic structure at a temperature coinciding with the onset of ferromagnetic order. We also observed the existence of a well-defined local orthorhombic structure on a short length scale of $\lesssim 5$ Å, resulting in a rather asymmetrical local environment of the Mn and As ions. Finally, the magnetic PDF revealed ferromagnetic alignment of Mn spins along the crystallographic $c$-axis, with robust nearest-neighbor ferromagnetic correlations that exist even above the ferromagnetic ordering temperature. We discuss these results in the context of other experiments and theoretical studies on this system.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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