Evaluation of bonding nature in Al-based quasicrystals by positron annihilation spectroscopy

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Our main goal is to establish a method of evaluation of bonding-nature in Al-based quasicrystals by positron annihilation spectroscopy. Al-based quasicrystals, which possess the pseudogap near the Fermi level, are novel candidates for new thermoelectric materials.We observed the clear correlation between the positron annihilation rate and electrical conductivity in various Al-based quasicrystals and related materials. The present correlation can be used to discuss the bonding nature in icosahedral clusters of the Al-based QCs. Establishing a method of evaluating the bonding nature of the Al-based QCs is necessary for future designs of material, such as thermoelectric materials.