Toward Insulating Quasicrystalline Alloy in Al-Pd-Re Icosahedral Phase

摘要

The resistivities in Al70Pd20Re10 alloy of the icosahedral phase are quite sample-dependent, possibly due to slight variation of the alloy composition. In some samples, the resistivity at room temperature is approximately 0.01 omega cm and that at 4.2 K is as high as approximately 0.1 omega cm; these values are much higher than any reported values so far for quasi-crystals. The temperature dependence of the conductivity is almost linear above 4.2 K and the magnetoconductivity is negative. These dependencies are interpreted by the theory of weak localization which takes into account the spin-orbit scattering.