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Study of Phason Hopping in Perfect Icosahedral AlFeCu Quasi-Crystals by Inelastic Neutron Scattering

We have studied a hopping process in perfect icosahedral Al62Cu25.5Fe12.5 powder samples by time-of-flight (TOF) quasi-elastic neutron scattering. Within the (ℏω, ℏQ)-window of the present experiment the signal observed is entirely due to copper motion. Its dependence on the neutron momentum transfer ℏQ suggests that this process remains confined in space and that it has a characteristic length of (3.9 ± 0.25) Å. Its dependence on the temperature T is interpreted as giving evidence for a depinning energy of 0.75 eV.