engleski

Electrical conductivity, Hall coefficient and thermoelectric power of icosahedral i- Al62Cu25.5Fe12.5 and i-Al63Cu25Fe12 quasicrystals

The electrical conductivity, Hall coefficient and thermoelectric power of icosahedral i- Al62Cu25.5Fe12.5 quasicrystal in temperature range 2 K - 340 K are examined, and comparison with icosahedral i-Al63Cu25Fe12 quasicrystal is made. We have analysed the temperature dependence of the conductivity below 70 K and the results of this analysis are consistent with predictions of weak- localisation and electron-electron interaction theories. The temperature dependence of electrical conductivity, Hall coefficient and thermoelectric power above 40K are consistently explained by a two band model. Although the picture that overlapping of the valence and the conduction bands at Fermi level is responsible for the coexistence of both types of carriers enable us to describe quasicrystals as semi-metals, the situation that temperature variation of the electrical conductivity is determined by that of carrier density is essentially the same as in the case of normal semiconductors.

electrical conductivity ; Hall coefficient ; thermoelectric power ; thermal conductivity ; specific heat ; icosahedral quasicrystals

nije evidentirano