Low Energy Charge and Spin Excitations probed by NMR and Transport

在这个项目中，高温超导体（HTSC）的电子和磁自由度将通过核磁共振（NMR）和输运测量（能斯特效应，热输运等）进行研究。赝能隙和自旋电荷不均匀性的研究将是这个项目的探索重点。这两种现象及其对超导性的影响尚不清楚。我们希望应用两种互补的实验方法-微观NMR和宏观输运测量-来全面了解这两种不寻常的现象及其对超导性的影响。特别地，我们希望利用这两种不同方法的组合，因为两者都对上述现象敏感，尽管每种方法测量的量完全不同。此外，目前还没有明确的比较两种方法的结果，即在我们的项目中，我们将能够直接比较同一样品的两种测量结果。我们的项目将完美地整合在研究单位内，因为NMR和运输测量电子和磁性的低能量激发，而研究单位的其他实验技术，如ARPES，中子散射和光学方法对高能激发敏感。

In this project, the electronic and magnetic degrees of freedom of the High Temperature Superconductors (HTSC) will be studied by means of Nuclear Magnetic Resonance (NMR) and transport measurements (Nernst effect, thermal transport, etc.). The investigation of the pseudogap and of spin and charge inhomogeneities will be the exploratory focus of this project. Both phenomena and their impact on superconductivity are unclear. We want to apply two complementary experimental methods – microscopic NMR and macroscopic transport measurements – to arrive at a comprehensive understanding of these two unusual phenomena and their impact on superconductivity. In particular, we wish to make use of the combination of these two different methods since both are sensitive to the above phenomena, despite the quantities measured by each method being completely different. Furthermore, no explicit comparison of results from the two methods currently exists, i.e. in our project we will be able to directly compare the results of both measurements on the same samples for the first time. Our project will be perfectly integrated within the Research Unit since NMR and transport measure electronic and magnetic low-energy excitations whereas the other experimental techniques of the Research Unit such as ARPES, Neutron scattering and the optical methods are sensitive to high-energy excitations.