メスバウアー核から見たカゴ状物質のフォノン

抄録

Nuclear resonant inelastic scattering (NRIS) is a unique tool to investigate element-specific phonon density of states by Mössbauer nuclei. This technique enables us to investigate the dynamics of the specific atoms which contain Mössbauer nuclei. For recent times, much attention to the potential of thermoelectricity has been paid in cage-structured compounds such as filled skutterudites, clathrates and so on. Since the proposal of “phonon-glass-electron-crystal” model, thermal insulation due to phonons has been expected as one of the important parameters in their thermoelectricity. We applied NRIS using several nuclei to the series of cage-structured compounds. We mainly show the recent results of filled skutterudites here.