Magnetoresistance of icosahedral Al-Cu-Fe from 80 mK to 80 K

Icosahedral Al62.5Cu25.5Fe12 and Al62.5Cu25Fe12.5 samples with resistivities at 4 K of about 4500 and 10 000 cm, respectively, have been studied. The magnetoresistance (B)/ was measured between 80 mK and 80 K up to 12 T at high temperatures. The results were well described by quantum corrections. The Coulomb interaction parameter F was independently obtained from the low-temperature (T)/, and was found to be in agreement with results from (B)/. The sign change of d/dT with increasing resistivity could be ascribed to an increasing F. The inelastic-scattering time ie saturated at low temperatures with a larger value for the high-resistivity sample. At 80 K, ie was about 10-13 s. Hence elastic scattering is intense and quasicrystals are electronically disordered materials. It is pointed out that these quasicrystals may be considered as model materials for the application of three-dimensional quantum-correction theories.