QUANTUM CORRECTIONS TO TRANSPORT-PROPERTIES OF ICOSAHEDRAL AL-CU-FE IN EXTENDED REGIMES

Studies of quantum corrections to the transport properties of icosahed ral Al-Cu-Fe (i-AlCuFe) have been made in extended regimes. The magnet oresistance, Delta rho(B,T), was measured and analyzed up to 12 T and ambient temperatures. Delta rho(B,T) was observed to change sign in th e range 90-120 K. Different analyses were made encompassing different assumptions about the background resistivity to which quantum correcti ons (QIE) should be added. In all cases accurate descriptions of Delta rho(B,T) were found, demonstrating that QIE is observable in i-AlCuFe at least up to 280 K. Common results for the parameters in these diff erent analyses include estimates of the temperature dependence of the Coulomb interaction parameter F-sigma in electron-electron interaction , and a low value of the inelastic scattering time tau(ie) at 280 K of order 100 fs, consistent with an elastic-scattering time of at most s ome femtoseconds. Using parameters determined from Delta rho(B,T) in t he analysis of the temperature dependence, Delta rho(T), it was found that quantitative agreement between descriptions of Delta rho(B,T) and Delta rho(T) in terms of QIE could be obtained up to 150 K. Weak loca lization thus contributes also to Delta rho(T) in i-AlCuFe at least up to this temperature.