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
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.
Signatures of bi-altermagnetism revealed by sublattice-specific circular dichroism in resonant inelastic X-ray scattering
National Synchrotron Radiation Research Center(国家同步辐射研究中心);University of Delhi(德里大学);Osaka Metropolitan University(大阪公立大学);Rice University(莱斯大学);Masaryk University(马萨里克大学);National Tsing Hua University(国立清华大学);University of Tokyo(东京大学);Rutgers University(罗格斯大学)
X-ray magnetic circular dichroism and resonant inelastic X-ray scattering explained: role of many-body correlation and valence fluctuations
Seoul National University(首尔大学);Institute for Basic Science(基础科学研究院);SLAC National Accelerator Laboratory(斯坦福直线加速器国家实验室);Fudan University(复旦大学);University of California, Davis(加州大学戴维斯分校);University of Illinois(伊利诺伊大学);National Institute of Standards and Technology(美国国家标准与技术研究院)
Universal dephasing rate due to diluted Kondo impurities
我们计算了弱无序金属中磁性杂质引起的退相速率。当磁性杂质的密度n_S足够低时,失相速率1/tau_phi是一个普适函数,1/tau_phi =(n_S/nu)f(T/T_K),其中T_K为近藤温度,nu为态密度。结果表明,具有典型能量转移Δ E的非弹性顶点修正被1/(tau_phi Δ E)的幂次抑制.因此,可以根据与π nu Im T成比例的非弹性截面来计算失相速率。|π nu T|其中T是T矩阵,它是用数值重整化群精确数值计算的。
Angular dependence of resonant inelastic x-ray scattering: a spherical tensor expansion
球张量展开进行表示的共振非弹性散射截面的总和的产品的基本光谱与张量涉及波矢量和偏振矢量的入射和散射光子。本文提出的表达式不同于Carra等人的有影响力的文章(Phys. Rev. Lett. 74,3700,1995),因为当将每个光子耦合到其自身时,它没有省略电偶极子和四极贡献之间的干涉项。讨论了球面张量展开的一些特殊情况。例如,各向同性样品的情况下被认为是和横截面表示为只有三个基本光谱的组合的情况下,电偶极子或电四极跃迁的吸收过程中,其次是电偶极子跃迁的发射。这种情况包括无纹理粉末样品的情况,这对应于实验中遇到的最常见的情况。最后,它是预测,一些圆二色性可以观察到各向同性的样品提供的散射光束的圆偏振可以检测。
$d$-wave altermagnetism revealed by resonant inelastic X-ray scattering
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences(中国科学院物理研究所凝聚态物理国家实验室);Department of Physics, Shanghai Normal University(上海师范大学物理系);Department of Physics, The Chinese University of Hong Kong(香港中文大学物理系);State Key Laboratory of Quantum Information Technologies and Materials, The Chinese University of Hong Kong(香港中文大学量子信息技术与材料国家重点实验室);PSI Center for Neutron and Muon Sciences, Paul Scherrer Institute(保罗谢尔研究所中子与μ子科学中心);Diamond Light Source, Harwell Campus(钻石光源哈韦尔园区);School of Physical Sciences, University of Chinese Academy of Sciences(中国科学院大学物理科学学院)
Indication of antiferromagnetic interaction between paramagnetic Co ions in the diluted magnetic semiconductor Zn$_{1-x}$Co$_{x}$O
采用X射线磁性圆二色性(XMCD)技术研究了ZnO(0001)衬底上不同氧分压下同质外延生长的Zn $_{1-x}$ Co $_x$ O($x=0.07$和0.10)薄膜在Co $2p$芯能级吸收边的磁性.吸收光谱的线形在所有的膜中是相同的,并且表明Co $^{2+}$离子取代了Zn位点。的磁场和温度的XMCD强度的依赖性是一致的磁化强度测量,表明除了钴有没有额外的来源的磁矩,并证明在同质外延Zn $_{1-x}$ Co $_{x}$ O薄膜的顺磁和铁磁成分的共存,相反,在异质外延Zn $_{1-x}$ Co $_{x}$ O薄膜的铁磁性先前研究。利用Curie-Weiss定律对XMCD的强度进行了分析,发现顺磁性Co离子之间存在反铁磁相互作用。缺失的XMCD强度和磁化强度信号表明,大多数的Co离子是非磁性的,可能是因为它们是强耦合的反铁磁彼此。在高真空中退火降低了顺磁和铁磁信号。我们将还原归因于Zn $_{1-x}$ Co $_{x}$ O中Co离子与反铁磁纳米团簇的热扩散和聚集。
Crystal field potential and short-range order effects in inelastic neutron scattering, magnetization and heat capacity of the cage-glass compound HoB12
Non-reciprocal circular dichroism of axial phonons coupled to ferro-rotational order
National Synchrotron Radiation Research Center(国家同步辐射研究中心);Department of Physics and Astronomy, The University of Tennessee(田纳西大学物理与天文系);Institute for Advanced Materials and Manufacturing, University of Tennessee(田纳西大学先进材料与制造研究所);Institute of Metal Physics(金属物理研究所);Department of Theoretical Physics and Applied Mathematics, Ural Federal University(乌拉尔联邦大学理论物理与应用数学系);Department of Physics and Materials Science, University of Luxembourg(卢森堡大学物理与材料科学系);Department of Physics, National Tsing Hua University(国立清华大学物理系)
Evolution of effective magnetic exchange interaction under spin dilution in SrIr$_{1-x}$Sn$_x$O$_3$
School of Physical Science and Technology, ShanghaiTech University(上海科技大学物理科学与技术学院);Institute of Physics, Chinese Academy of Sciences(中国科学院物理研究所);Center for Transformative Science, ShanghaiTech University(上海科技大学变革科学中心)