Evidence for core-hole-mediated inelastic x-ray scattering from metallic Fe$_{1.087}$Te
J. N. Hancock, R. Viennois, D. van der Marel, H. M. Rønnow, M. Guarise, P. -H. Lin, M. Grioni, M. Moretti Sala, G. Ghiringhelli, V. N. Strocov, J. Schlappa, T. Schmitt
We present a detailed analysis of resonant inelastic scattering (RIXS) from Fe$_{1.087}$Te with unprecedented energy resolution. In contrast to the sharp peaks typically seen in insulating systems at the transition metal $L_3$ edge, we observe spectra which show different characteristic features. For low energy transfer, we experimentally observe theoretically predicted many-body effects of resonant Raman scattering from a non-interacting gas of fermions. Furthermore, we find that limitations to this many-body electron-only theory are realized at high Raman shift, where an exponential lineshape reveals an energy scale not present in these considerations. This regime, identified as emission, requires considerations of lattice degrees of freedom to understand the lineshape. We argue that both observations are intrinsic general features of many-body physics of metals.
Comprehensive Research Organization for Science and Society (CROSS)（综合科学研究组织）；Tohoku University（东北大学）；Japan Atomic Energy Agency (JAEA)（日本原子能研究开发机构）；Ibaraki University（茨城大学）；Tokyo City University（东京都立大学）；The University of Tokyo（东京大学）
Size dependent electric voltage-controlled magnetic anisotropy in multiferroic heterostructures: Interface-charge and strain co-mediated magnetoelectric coupling
Strong enhancements to superconducting properties of 1D systems from metallic reservoirs
Heriot-Watt University（赫瑞-瓦特大学）；University of Geneva（日内瓦大学）；Weizmann Institute of Science（魏茨曼科学研究所）；Max-Planck-Institut für Physik komplexer Systeme（马克斯·普朗克复杂系统物理研究所）
Indirect magnetic interaction mediated by spin dimer in Cu$_2$Fe$_2$Ge$_4$O$_{13}$
Cu $_2$ Fe $_2$ Ge $_4$ O $_{13}$是一种双组分化合物，由具有不同能量标度的Cu二聚体和Fe链组成。利用高能量分辨率的非弹性中子散射技术，我们观察到铜二聚体的间接铁-铁交换耦合。得到的有效间接相互作用和相关超交换相互作用的参数与半静态估计值一致。这种一致性表明，铜二聚体在间接磁相互作用中起着介电介质的作用。
Magnetic excitations in double perovskite iridates La$_{2}$$\mathit{M}$IrO$_{6}$ ($\mathit{M}$ = Co, Ni, and Zn) mediated by 3$\mathit{d}$-5$\mathit{d}$ hybridization
Resonant Inelastic X-ray Scattering Study of Electron-Exciton Coupling in High-Tc Cuprates
要解释高$T_c$铜酸盐的超导机制，需要了解是什么导致电子形成库珀对。配对可以通过声子、屏蔽库仑力、自旋或电荷涨落、激子或这些的组合来介导。一个激子配对机制已被假定，但实验证据之间的耦合在铜酸盐的传导电子和激子是零星的。本文用共振非弹性X射线散射（RIXS）方法测量了不同载流子浓度的Bi $_2$ Sr $_2$ CaCu $_2$ O $_{8-x}$（Bi-2212）晶体的$\underline{d}d$激子谱随温度的变化。当材料从正常态转变为超导态时，我们观察到$\underline{d}d$激子谱的显著变化。我们的观察表明，当材料进入超导相时，在过掺杂（欠掺杂）样品中的$\underline{d}d$激子开始向上（向下）移动。我们属性的超导诱导效应和它的符号反转从欠掺杂到过掺杂的交换耦合的$\underline{d}d$激子的网站周围的铜自旋。
Interplay between Heavy Fermions and Crystal Field Excitation in Kondo Lattices. Low-Temperature Thermodynamics and Inelastic Neutron Scattering Spectra of CeNiSn
