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arXiv 2201.13061cond-mat.str-el
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稀磁半导体Ba $_{1-x}$ K $_{x}$(Zn $_{1-y}$ Mn $_{y}$)$_{2}$ As $_{2}$中Mn离子的磁性和电子结构的X射线磁圆二向色性和共振非弹性X射线散射研究

Magnetic Properties and Electronic Configurations of Mn Ions in the Diluted Magnetic Semiconductor Ba$_{1-x}$K$_{x}$(Zn$_{1-y}$Mn$_{y}$)$_{2}$As$_{2}$ Studied by X-ray Magnetic Circular Dichroism and Resonant Inelastic X-ray Scattering

H. Suzuki, G. Q. Zhao, J. Okamoto, S. Sakamoto, Z. -Y. Chen, Y. Nonaka, G. Shibata, K. Zhao, B. J. Chen, W. -B. Wu, F. -H. Chang, H. -J. Lin, C. -T. Chen, A. Ta… 展开作者

H. Suzuki, G. Q. Zhao, J. Okamoto, S. Sakamoto, Z. -Y. Chen, Y. Nonaka, G. Shibata, K. Zhao, B. J. Chen, W. -B. Wu, F. -H. Chang, H. -J. Lin, C. -T. Chen, A. Tanaka, M. Kobayashi, Bo Gu, S. Maekawa, Y. J. Uemura, C. Q. Jin, D. J. Huang, A. Fujimori

摘要:

用X射线磁圆二色性(XMCD)和Mn $L_{2,3}$边的共振非弹性X射线散射(RIXS)研究了新稀磁半导体Ba $_{1-x}$ K $_{x}$(Zn $_{1-y}$ Mn $_{y}$)$_{2}$ As $_{2}$的磁性和电子激发.对XMCD谱的求和规则分析得到了$0.45μ_{\text{B}}$ /Mn的净自旋矩和$0.05μ_{\text{B}}$ /Mn的小轨道矩。这表明Mn原子处于$d^{5}$的高自旋构型中,而Mn离子之间存在竞争的铁磁和反铁磁相互作用降低了净自旋矩。RIXS光谱显示从1至6 eV能量损失的宽峰,其源自Mn离子的$d$-$d$晶场激发。通过与Ga $_{1-x}$ Mn $_{x}$ As的RIXS谱线形状的比较,我们认为Ba $_{1-x}$ K $_{x}$中Mn的基态(Zn $_{1-y}$ Mn $_{y}$)$_{2}$由于$_{2}$不仅由电荷转移的$3d^{5}\underline{L}$电子构型组成,($\underline{L}$:配体空穴)具有如Ga $_{1-x}$ Mn $_{x}$ As中的弱结合空穴,但也具有具有自由空穴的纯$3d^{5}$构型。

英文摘要:

The magnetic properties and the electronic excitations of the new diluted magnetic semiconductor Ba$_{1-x}$K$_{x}$(Zn$_{1-y}$Mn$_{y}$)$_{2}$As$_{2}$ have been studied by x-ray magnetic circular dichroism (XMCD) and resonant inelastic x-ray scattering (RIXS) at the Mn $L_{2,3}$ edge. The sum rule analysis of the XMCD spectra yields the net spin moment of $0.45μ_{\text{B}}$/Mn and the small orbital moment of $0.05μ_{\text{B}}$/Mn. This indicates that the Mn atoms are in the high-spin configurations of $d^{5}$, whereas the presence of competing ferromagnetic and antiferromagnetic interactions between the Mn ions reduces the net spin moment. RIXS spectra show broad peaks from 1 to 6 eV energy loss, which originate from the $d$-$d$ crystal field excitations of the Mn ions. Based on a comparison of the RIXS line shapes with those of Ga$_{1-x}$Mn$_{x}$As, we conclude that the ground state of Mn in Ba$_{1-x}$K$_{x}$(Zn$_{1-y}$Mn$_{y}$)$_{2}$As$_{2}$ consists not only of the charge-transferred $3d^{5}\underline{L}$ electron configuration ($\underline{L}$: ligand hole) with weakly bound holes as in Ga$_{1-x}$Mn$_{x}$As, but also of the pure $3d^{5}$ configuration with free holes.

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