Magnetism and Superconductivity in Iron-based Superconductors as Probed by Nuclear Magnetic Resonance

Nuclear Magnetic Resonance (NMR) has been a fundamental player in the studies of superconducting materials for many decades. This local probe technique allows for the study of the static electronic properties as well as of the low energy excitations of the electrons in the normal and the superconducting state. On that account it has also been widely applied to Fe-based superconductors from the very beginning of their discovery in February 2008. This dissertation comprises some of these very first NMR results, reflecting the unconventional nature of superconductivity and its strong link to magnetism in the investigated compounds LaO 1–x F x FeAs and LiFeAs. Front Matter....Pages I-XV Introduction....Pages 1-2 Basic Principles of NMR....Pages 3-30 NMR in the Superconducting State....Pages 31-40 Iron-based Superconductors....Pages 41-52 Experimental Setup....Pages 53-66 NMR on LaO 1−x F x FeAs in the Normal State....Pages 67-96 NMR and NQR on LaO 1−x F x FeAs in the Superconducting State....Pages 97-109 NMR and NQR on LiFeAs....Pages 111-130 Conclusions....Pages 131-134 Back Matter....Pages 135-172