Itinerant and localized magnetism in Fe based superconductors - Electron Spin Resonance spectroscopy and single crystal growth

将在铁磷属化合物和相关系统中进行X-（9 GHz）和Q-波段（34 GHz）频率的电子自旋共振实验。本地化磁矩和传导电子系统的耦合将在掺杂EuFe 2As 2基材料进行研究，并在静水压力下的EuFe 2As 2的测量相比，高达3 GPa。我们将研究LfeAsO_（1-x）Fx（L = La，Ce，Pr，Nd，Sm）和Fe_（1 +x）Se衍生物体系的直接传导电子自旋共振，通过自旋密度波和超导基态的线宽来获得传导电子体系的动态自旋磁化率和自旋-晶格弛豫时间的信息。超导FeSe 1-yTey和Fe 1 + xSe的中子散射和红外光谱研究所需的大的高质量单晶的生长是通过探索和优化不同的合成技术来实现的进一步目标。

Electron spin resonance experiments at X- (9 GHz) and Q-band (34 GHz) frequencies will be performed in iron pnictides and related systems. The coupling of localized magnetic moments and the conduction electron system will be studied in doped EuFe2As2-based materials and compared to measurements of EuFe2As2 under hydrostatic pressure up to 3 GPa. The direct conduction electron spin resonance will be investigated in the LfeAsO1-x Fx (L = La, Ce, Pr, Nd, Sm) and the binary Fe1+x Se-derived systems to access the dynamic spin susceptibility of the conduction electron system and get information on the spin-lattice relaxation time via the linewidth in the spin-density-wave and superconducting ground state. The growth of large high-quality single crystals necessary for neutron scattering and infrared spectroscopy studies of superconducting FeSe1-y Tey and Fe1+x Se is a further goal to be reached by the exploration and optimization of different synthesis techniques.