Polygrain icosahedral Al-Pd-Re quasicrystal as a granular electronic conductorYu. Kh. Vekilov1 and M. A. Chernikov1, 2
1 Moscow State Institute of Steel and Alloys - 119049 Moscow, Russian Federation
2 Russian Research Center “Kurchatov Institute” - 123182 Moscow, Russian Federation
received 4 March 2009; accepted in final form 23 June 2009; published July 2009
published online 24 July 2009
The mechanism of low-temperature electronic transport in polygrain samples of icosahedral Al-Pd-Re is analyzed by analogy with granular electronic systems. The intergranular tunneling and electrostatic energy (Coulomb blockade) are responsible for a specific behaviour of the electrical conductivity in polygrain samples of icosahedral Al-Pd-Re at low temperatures. Depending on the structural state of the sample, both factors may be important and the variable-range hopping regime, of Efros-Shklovskii's type, takes place. For the strong-coupling state the tunneling prevails, and the low-temperature variation of the electrical conductivity is dominated by the Coulomb-interaction and weak-localization corrections.
72.15.-v - Electronic conduction in metals and alloys.
71.23.Ft - Quasicrystals.
© EPLA 2009