Absence of fine structure in the photoemission spectrum of the icosahedralAl-Pd-Mn quasicrystal - art. no. 214202

The results of the low-temperature ultrahigh-energy-resolution photoemissio n studies of a single-grain icosahedral alloy Al70Pd21.5Mn8.5 have been pre sented. The existence of the theoretically predicted pseudogap in the densi ty of states at the Fermi energy has been confirmed. No evidence of the the oretically predicted spikiness of the density of states could be observed. It has been suggested that the failure to detect the predicted spikiness of the density of states in icosahedral quasicrystals is consistent with the results of Zijlstra and Janssen [Europhys. Lett. 52, 578 (2000)] who showed that the spikiness occurs only in lower-order periodic approximants to ico sahedral quasicrystals, but does not survive in the quasiperiodic limit.