ABSTRACT
This chapter provides muon spin research (µSR)-spectroscopy in the study of static magnetic properties in the paramagnetic or diamagnetic phase as well as in the magnetically ordered phase of metallic systems. In general this involves transverse field-measurements and the determination of the µ+-Knight shift. In this respect these studies have common with nuclear magnetic resonance (NMR)-measurements. However µSR has the advantage that it is not plagued by the skin effect, that it can be applied to single crystals and that the µ+, as a spin-12 probe, is only sensitive to magnetic interactions. In contrast to NMR the µ+ is generally found at an interstitial position and therefore probes the magnetic properties of the host crystal from a different perspective. The chapter considers orbital Van Vleck paramagnetism in systems with 4f- or 5f-electron shells subject to crystalline electric field splitting. It also considers the direct effect of an external field on the spin polarisation or magnetisation of the conduction electrons.
