Structural Vacancies of Al-based Quasicrystals and Anomalous Transport Property: Positron Annihilation Studies

We have discussed the relationship between the structural vacancies and anomalous transport properties of stable Al-based quasicrystals, taking into account the anomalous transport mechanism in quasicrystal-like state and experimental data for stable Al-based quasicrystals by positron annihilation methods. It is suggested strongly that the covalent bonding nature, which is induced by the structural vacancies, and high sp-d hybridization relate with the enhancement of the pseudogap near the Fermi energy EF.