title: Bulk electronic structure of quasicrystals.
abstract: We 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 E(F) indicating that it is close to the metal-insulator phase boundary.
authors.affiliation: UGC-DAE Consortium for Scientific Research, Khandwa Road, Indore 452001, India.
authors.forename: J
authors.initials: J
authors.lastname: Nayak
authors.forename: M
authors.initials: M
authors.lastname: Maniraj
authors.forename: Abhishek
authors.initials: A
authors.lastname: Rai
authors.forename: Sanjay
authors.initials: S
authors.lastname: Singh
authors.forename: Parasmani
authors.initials: P
authors.lastname: Rajput
authors.forename: A
authors.initials: A
authors.lastname: Gloskovskii
authors.forename: J
authors.initials: J
authors.lastname: Zegenhagen
authors.forename: D L
authors.initials: DL
authors.lastname: Schlagel
authors.forename: T A
authors.initials: TA
authors.lastname: Lograsso
authors.forename: K
authors.initials: K
authors.lastname: Horn
authors.forename: S R
authors.initials: SR
authors.lastname: Barman