THz- and Infrared Investigations of Iron-Pnictides

铁磷族化合物的太赫兹和红外研究

• 批准号: 207066774
• 负责人: Professor Dr. Martin Dressel
• 金额: --
• 依托单位: 1. Physikalisches Institut
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2012
• 资助国家: 德国
• 起止时间: 2011-12-31 至 2015-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/207066774?language=en
• 关键词: THz; Infrared; Investigations; Iron; Pnictides

Applying optical methods to iron-pnictides, we want to explore the interaction of magnetism and superconductivity, the multi-band effect, the influence of electronic correlations and the electron-bosonic coupling. From the analysis of our broad-band spectra we obtain information on electronic transitions, the shift of spectral weight, the opening of energy gaps, but also on the low-energy scattering effects. The determination of the superconducting gap, its symmetry, possible states in the gap, and of the superfluid carrier density is crucial for the characterization of the superconducting state. In the Eu-122-compounds the magnetic coupling of the Eu- and Fe-subsystems is of particular importance; it will be tuned by an external magnetic field.

我们希望将光学方法应用于铁磷化物，探索磁性与超导的相互作用、多能带效应、电子关联的影响以及电子-玻色子耦合。通过对宽带光谱的分析，我们获得了有关电子跃迁、光谱权重的变化、能隙的开放以及低能散射效应的信息。超导间隙、其对称性、间隙中可能的状态以及超流体载流子密度的确定对于超导状态的表征至关重要。在 Eu-122 化合物中，Eu 和 Fe 子系统的磁耦合特别重要；它将通过外部磁场进行调谐。