The synthesis of new quasicrystals in sp-electron alloy systems and their metal-insulator transitions

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In this study, we have searched quasicrystals and approximantsin new alloy systems including sp-electron elements (Al, Si, Ge, etc.) and sought after new physical properties, e.g. a possibility of metal-insulator transitions in the quasiperiodic structure. We have found new quasicrystals and approximants in some alloy systems. Although we cannot yet find the metal-insulator transition because the concentration of Si or Geisn't over 50% in these alloys, we have got new results: a intermediate valence of Yb in the Pd 48Ge 36Yb 16 approximant of an icosahedral quasicrystal, spin-glass-type ordering in the Mn 76Si 18Cr 6 approximant of a dodecagonal quasicrystal and so on.