Document Type

Article

Publication Date

11-20-2012

Journal or Book Title

Physical Review Letters

Volume

109

Issue

21

First Page

216403

DOI

10.1103/PhysRevLett.109.216403

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 EF indicating that it is close to the metal-insulator phase boundary.

Comments

This article is from Physical Review Letters 109 (2012): 216403, doi:10.1103/PhysRevLett.109.216403.

Copyright Owner

American Physical Society

Language

en

File Format

application/pdf

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