Bulk Electronic Structure of QuasicrystalsPhysical Review Letters
AbstractWe use hard x-ray photoemission to resolve a controversial issue regarding the mechanism for the formation of quasicrystalline solids, i.e., the existence of a pseudogap at the Fermi level. Our data from icosahedral fivefold Al-Pd-Mn and Al-Cu-Fe quasicrystals demonstrate the presence of a pseudogap, which is not observed in surface sensitive low energy photoemission because the spectrum is affected by a metallic phase near the surface. In contrast to Al-Pd-Mn, we find that in Al-Cu-Fe the pseudogap is fully formed; i.e., the density of states reaches zero at EF indicating that it is close to the metal-insulator phase boundary.
Copyright OwnerAmerican Physical Society
Citation InformationJ. Nayak, M. Maniraj, Abhishek Rai, Sanjay Singh, et al.. "Bulk Electronic Structure of Quasicrystals" Physical Review Letters Vol. 109 Iss. 21 (2012) p. 216403
Available at: http://works.bepress.com/d_l_schlagel/83/