Valence and orbital states of rare earth Heavy Fermion compounds close to the quantum critical point: Resonant and non-resonant inelastic X-ray scattering investigations.

接近量子临界点的稀土重费米子化合物的价态和轨道态：共振和非共振非弹性 X 射线散射研究。

• 批准号: 223392744
• 负责人: Dr. Andrea Severing
• 金额: --
• 依托单位: Institut für Experimentalphysik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2013
• 资助国家: 德国
• 起止时间: 2012-12-31 至 2016-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/223392744?language=en
• 关键词: Valence; orbital; states; rare; earth

In the very rich temperature-pressure-magnetic field-substitution phase diagram Heavy Fermion systems display a wealth of fascinating phenomena such as quantum criticality and unconventional superconductivity with magnetism lying close by. Heavy Fermion properties are governed by the delicate balance of the strong coulomb repulsion between the electrons of the f shell and the hybridization between f and conduction electrons, so that electronic properties such as occupancy nf of the f states, energy scales determined by the Kondo temperature TK, and the wave functions of the Hund's rule ground state are key parameters to model these phase properties. Here we propose a systematic investigation of these key parameters in the vicinity of the quantum critical point by spectroscopic means. The availability of high-brilliance third generation synchrotron sources makes electron spectroscopies as resonant and non-resonant inelastic x-ray scattering (RIXS, NRIXS) under extreme conditions possible.

在非常丰富的温度-压力-磁场-替代相图中，重费米子系统显示出大量迷人的现象，如量子临界性和非常规超导性，磁性就在附近。重费米子的性质是由f壳层电子之间的库仑排斥力和f与传导电子之间的杂化力的微妙平衡决定的，因此电子性质如f态的占有率nf、由近藤温度TK确定的能量尺度和洪德规则基态的波函数是模拟这些相性质的关键参数。在这里，我们提出了一个系统的调查，这些关键参数的量子临界点附近的光谱手段。高亮度第三代同步辐射源的可用性使得极端条件下的共振和非共振非弹性X射线散射（RIXS，NRIXS）电子光谱学成为可能。

项目成果

Quantitative study of valence and configuration interaction parameters of the Kondo semiconductors CeM2Al10 (M = Ru, Os and Fe) by means of bulk-sensitive hard X-ray photoelectron spectroscopy

通过体敏硬 X 射线光电子能谱定量研究近藤半导体 CeM2Al10（M = Ru、Os 和 Fe）的价态和构型相互作用参数

• DOI: 10.1016/j.elspec.2015.01.004
• 发表时间: 2015
• 期刊: Journal of Electron Spectroscopy and Related Phenomena
• 影响因子: 1.9
• 作者: F. Strigari;M. Sundermann;Y. Muro;K. Yutani;T. Takabatake;K.-D. Tsuei;Y.F. Liao;A. Tanaka;P. Thalmeier;M.W. Haverkort;L.H. Tjeng;A. Severing
• 通讯作者: A. Severing

Direct bulk-sensitive probe of 5f symmetry in URu2Si2

• DOI: 10.1073/pnas.1612791113
• 发表时间: 2016-08
• 期刊: Proceedings of the National Academy of Sciences
• 作者: M. Sundermann;M. Haverkort;S. Agrestini;A. Al-Zein;M. Moretti Sala;Y. Huang;M. Golden;A. de Visser;P. Thalmeier;L. Tjeng;A. Severing

Quantitative study of the f occupation in CeMIn5 and other cerium compounds with hard X-rays

• DOI: 10.1016/j.elspec.2016.02.002
• 发表时间: 2016-05-01
• 期刊: JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA
• 影响因子: 1.9
• 作者: Sundermann, M.;Strigari, F.;Severing, A.
• 通讯作者: Severing, A.

Correlation between the valence state of cerium and the magnetic transition in Ce (Ru 1 - X Fe x) 2 Al 10 studied by resonant x-ray emission spectroscopy

X射线共振发射光谱研究了铈价态与Ce(Ru 1 - X Fe x) 2 Al 10 磁转变的相关性

• DOI: 10.1103/physrevb.89.125108
• 发表时间: 2014
• 期刊: Physical Review B
• 影响因子: 3.7
• 作者: Y. Zekko;Y. Yamamoto;H. Yamaoka;H. Tajima;T. Nishioka;F. Strigari;A. Severing;J.-F. Lin;N. Hiraoka;H. Ishii;K.-D. Tsuei;J. Mizuki
• 通讯作者: J. Mizuki

Absence of orbital rotation in superconducting CeCu2Ge2

超导 CeCu2Ge2 不存在轨道旋转

• DOI: 10.1103/physrevb.91.201108
• 发表时间: 2015
• 期刊: Physical Review B
• 影响因子: 3.7
• 作者: J.-P. Rueff;J.M. Ablett;F. Strigari;M. Deppe;M.W. Haverkort;L.H. Tjeng;A. Severing
• 通讯作者: A. Severing