Bulk Electronic Structure of Quasicrystals

TitleBulk Electronic Structure of Quasicrystals
Publication TypeJournal Article
Year of Publication2012
AuthorsNayak J, Maniraj M, Rai A, Singh S, Rajput P, Gloskovskii A, Zegenhagen J, Schlagel DL, Lograsso TA, Horn K, Barman SR
Journal TitlePhysical Review Letters
Date Published11
Type of ArticleArticle
ISBN Number0031-9007
Accession NumberWOS:000311284200012
Keywordsalloys, density-of-states, dispersion, phase, PHOTOEMISSION-SPECTROSCOPY, ray photoelectron-spectroscopy, resolution, resolved photoemission, surface

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.

URL<Go to ISI>://WOS:000311284200012
Alternate JournalPhys. Rev. Lett.