ARPES of iron-based superconductors

铁基超导体的ARPES

• 批准号: 168592960
• 负责人: Dr. Sergey Borisenko
• 金额: --
• 依托单位: Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden (IFW) e.V.
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2010
• 资助国家: 德国
• 起止时间: 2009-12-31 至 2017-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/168592960?language=en
• 关键词: ARPES; iron; based; superconductors

100 years ago humanity learned how to liquify helium and this led to discovery of superconductivity in metals at very low temperatures (~4K). The cuprate superconductors, discovered a couple of decades ago, lose their resistance at relatively high temperatures (up to ~140K), but unlike their low-temperature counterparts remain not completely understood until now. The critical temperatures achieved so far in newly synthesized iron arsenide superconductors are not very high (< 50 K) but industrial potential is, since the main component is the iron. The aim of this proposal is to study the electronic structure of new superconductors. The latest developments of the modern high-resolution angle-resolved photoemission spectroscopy will be applied to investigate a series of iron pnictides. Photoemission spectroscopy should deliver the information about the size, shape, topology and the nesting properties of the Fermi surface; amplitude, anisotropy and character of the superconducting and density waves energy gaps; dispersion of the electronic states, their symmetry and Fermi velocity; real and imaginary parts of the self-energy, charge susceptibility and a coupling strength to bosonic degrees of freedom. In order to rule out any surface related factors which in some cases can modify photoemission signal the modern computational methods will be employed to characterize such possible influence. The main goal of the proposal is to investigate those aspects of the low energy electron dynamics, which together with the knowledge gained by other teams of the Priority Program will help to understand the mechanism of high-temperature superconductivity in iron pnictides.

100年前，人类学会了如何液化氦，这导致了金属在极低温度(~4K)下的超导电性的发现。几十年前发现的铜酸盐超导体在相对较高的温度(高达~140K)下会失去电阻，但与低温超导体不同的是，直到现在还没有完全了解它们。到目前为止，新合成的砷化铁超导体达到的临界温度不是很高(&lt；50K)，但工业潜力很大，因为主要成分是铁。这项提议的目的是研究新超导体的电子结构。现代高分辨角度分辨光电子能谱的最新发展将被应用于一系列铁质陨石的研究。光电子能谱应提供以下信息：费米面的大小、形状、拓扑和嵌套性质；超导波和密度波能隙的幅度、各向异性和特征；电子态的色散、对称性和费米速度；自能的实部和虚部、电荷磁化率和玻色子自由度的耦合强度。为了排除在某些情况下可以改变光电发射信号的任何表面相关因素，将使用现代计算方法来表征这种可能的影响。该提议的主要目的是研究低能电子动力学的那些方面，结合优先计划其他小组所获得的知识，将有助于理解铁粒子中高温超导的机制。