コンプトン散乱を用いた重元素結晶のフェルミ面マッピング

抄録

We report on the Fermi surface mapping of heavy element crystals using Compton scattering, which has been possible by the recent advent of intense high energy synchrotron radiation sources. Fermi surface mapping provides us insights for long range distortions or charge density waves in crystals. Two examples are shown : The first one is Fermi surface mapping of the η-Mo₄O₁₁ low-dimensional conductor. A clear nesting vector is observed in the Fermi surfaces that have experimentally been obtained. The second example is Fermi surface study of Ba_1-xK_xBiO₃. A clear feature of the Fermi surface nesting is observed across the transition between the distorted (insulating) and non-distorted (metallic) phases.