Nematic susceptibility and quantum oscillations in uniaxially stressed FeSe and LaFePO.

单轴应力 FeSe 和 LaFePO 中的向列磁化率和量子振荡。

• 批准号: 429883427
• 负责人: Professor Dr. Jochen Geck
• 金额: --
• 依托单位: Max-Planck-Institut für Chemische Physik fester Stoffe (MPI CPfS)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/429883427?language=en
• 关键词: Nematic; susceptibility; quantum; oscillations; uniaxially

This proposal is to study the stoichiometric iron-based compounds FeSe and LaFePO under strong uniaxial stress, through X-ray structural studies and measurements of quantum oscillations. The goal is two-fold. 1. Can the Poisson’s ratio -dεyy/dεxx, where εxx and εyy are respectively the longitudinal and transverse strains, serve as a measure of nematic susceptibility? At present the elastoresistivity d(ρxx - ρyy)/d(εxx - εyy) is the conventional probe of nematic susceptibility but its analytical usefulness is limited by the fact that resistivity is not a thermodynamic quantity. 2. How do the electronic structures of these compounds evolve under strong uniaxial distortion, that induces or enhances nematic order? This knowledge will help us better untangle the electronic interactions in the unstressed compounds. We propose to hire one student, who will split his or her time approximately equally between TU Dresden and MPI-CPfS.

本研究计划通过X射线结构研究和量子振荡测量，研究化学计量比的铁基化合物FeSe和LaFePO在强单轴应力下的结构。目标是双重的。1.泊松比-dεyy/dεxx（其中εxx和εyy分别是纵向和横向应变）是否可以作为磁化率的度量？弹性电阻率d（ρxx - ρyy）/d（εxx - εyy）是目前常用的磁化率探针，但由于电阻率不是热力学量，其分析应用受到限制。2.这些化合物的电子结构如何在强单轴扭曲下演化，诱导或增强了单轴有序？这些知识将帮助我们更好地解开无应力化合物中的电子相互作用。我们建议雇用一名学生，他或她将在德累斯顿工业大学和MPI-CPfS之间平均分配时间。