Fermi Surface Properties, Metamgnetic Transition and Quantum Phase Transition of CeRu$_2$Si$_2$ and Its Alloys Probed by the dHvA Effect--Fermi Surface Studies on the Itinerant and Localized Dichotomy of $f$ Electron Nature

摘要: This article describes the Fermi surface properties of CeRu$_2$Si$_2$ and its alloy systems CeRu$_2$(Si$_x$Ge$_{1-x}$)$_2$ Ce$_x$La$_{1-x}$Ru$_2$Si$_2$ studied by de Haas - van Alphen (dHvA) effect. We pay particular attention to how f electron state change with magnetic properties, in they associated metamagnetic transition quantum phase transition. After summarizing important physical CeRu$_2$Si$_2$, we present diagrams as a function temperature, field concentration $x$. From characteristic features diagram, argue that ferromagnetic interaction addition anitferromagnetic Kondo effect is responsible for transitions these are relevant interaction. summarize fields below where now well understood theoretically experimentally. experimental results above show significantly different from those many aspects. not appropriately described terms either itinerant or localized electron. The presented discuss ground state. ...