Metal-insulator transition in quasicrystalline AlPdRe

Transport properties of icosahedral AlPdRe alloys are studied. The magnetoresistance displays a metal-insulator transition (MIT), as a function of increasing resistance ratio R [=ρ(4.2 K)/ρ(295 K)] . The conductivity, σ( T), saturates at a finite value also for insulating samples at low enough temperatures. σ(0 K) for i-AlPdRe is found to decrease over 4 orders of magnitude for increasing R with a change of slope at the MIT.