The temperature dependence of the magnetoresistance (MR) of insulating Al70Pd22.5Re7.5 quasicrystals taken at liquid-helium temperatures can be explained by the theories of MR-the forward interference and the wave-function shrinkage - in the variable-range hopping (VRH) regime. By analyzing the MR data with the theories mentioned above, a crossover from Mott VRH conduction to Efros-Shklovskii VRH conduction at liquid helium temperatures was identified in a highly resistive Al70Pd22.5Re7.5 sample. The rapid decrease in the negative MR of highly resistive samples at low temperatures might be attributed to the conduction via the states in the Coulomb gap.
|Number of pages||6|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|State||Published - 1 Aug 2002|