Multi-Component Electronic Correlations in Non-Centrosymmetric f-Electron Compounds

非中心对称 f 电子化合物中的多组分电子相关性

• 批准号: 323760292
• 负责人: Dr. Marc Wilde
• 金额: --
• 依托单位: Matematicko-fyzikální fakulta
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2017
• 资助国家: 德国
• 起止时间: 2016-12-31 至 2021-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/323760292?language=en
• 关键词: Multi; Component; Electronic; Correlations; Non

In metallic f-electron compounds the effects of electronic correlations are exceptionally pronounced, driving conventional and unconventional forms of spin and charge order. Despite many decades of intense research in heavy fermion materials, an important unresolved question concerns to what extent the effects of strong correlations reflect the interplay of nearly equivalent energy scales such as magnetic interactions, spin and lattice anisotropies, crystal electric fields magneto-elastic coupling etc. Recent studies in non-centrosymmetric f-electron compounds reveal, that the coupling of phonons, crystal field excitations and magnons stabilise new forms of hybrid excitations, unconventional superconductivity and complex forms of magnetic order. We propose to develop a detailed phenomenological account of the nature of electronic correlations in carefully selected non-centrosymmetric f-electron compounds, combining the preparation of high quality single-crystals, bulk and transport measurements under extreme conditions, comprehensive neutron scattering studies and measurements of quantum oscillations. We propose to focus in our studies on the class of isostructural CeTAl3 and CeTGa3 compounds (where T stands for a transition metal), as well as complimentary systems selected to expose unconventional behaviour.

在金属 f 电子化合物中，电子相关性的影响异常明显，驱动着传统和非常规形式的自旋和电荷有序。尽管对重费米子材料进行了数十年的深入研究，但一个重要的未解决问题是，强相关性的影响在多大程度上反映了几乎等效能量尺度的相互作用，例如磁相互作用、自旋和晶格各向异性、晶体电场磁弹性耦合等。最近对非中心对称 f 电子化合物的研究表明，声子的耦合、晶体场激发 磁振子稳定了新形式的混合激发、非常规超导性和复杂形式的磁序。我们建议结合高质量单晶的制备、极端条件下的体积和输运测量、全面的中子散射研究和量子振荡的测量，对精心挑选的非中心对称 f 电子化合物中的电子关联性质进行详细的唯象解释。我们建议重点研究同构 CeTAl3 和 CeTGa3 化合物（其中 T 代表过渡金属），以及选择用于揭示非常规行为的互补系统。