Investigation of low-energy excitations of iron-based superconductors by NMR and transport

在这个项目中，新的铁磷属元素化物超导体的不寻常的电子和磁性将通过核磁共振（NMR，NQR）和输运测量进行研究。我们将联合收割机这两个互补的微观和宏观实验探针在相同的样品，以达到一个全面的理解的不寻常的现象和它们对超导铁磷属元素的影响。我们的研究将涵盖整个掺杂范围，包括正常状态和超导状态，以及自旋密度波（SDW）形成的母体化合物的后果。在正常状态下，我们的兴趣关注异常运输，低能量自旋涨落，赝能隙现象，和电子不均匀性出现的SDW秩序的残余。在超导态下，我们将探索它的能隙结构，并寻找短程反铁磁有序与超导电性共存的证据。

In this project the unusual electronic and magnetic properties of the new iron pnictide superconductors will be studied by means of Nuclear Magnetic Resonance (NMR, NQR) and transport measurements. We will combine these two complementary microscopic and macroscopic experimental probes on the same samples in order to arrive at a comprehensive understanding of the unusual phenomena and their impact on superconductivity in the iron pnictides. Our investigations will cover the whole doping range including the normal state and the superconducting state as well as the consequences of spin density wave (SDW) formation in the parent compounds. In the normal state, our interests concern anomalous transport, low energy spin fluctuations, pseudogap phenomena, and electronic inhomogeneities which appear as remnants of the SDW order. In the superconducting state we will explore its gap structure, and search for evidence of the coexistence of short range antiferromagnetic order and superconductivity.