Photoemission and optical spectroscopy of i-ZnMgEr quasicrystal
2005 (English)In: Acta Physica Polonica. A, ISSN 0587-4246, Vol. 107, no 2, 412-419 p.Article in journal (Refereed) Published
The results of photoemission and optical studies of icosahedral single-grain ZnMgEr quasicrystals are presented. Synchrotron radiation photoemission measurements were performed on in situ cleaved samples at 10(-10) mbar pressure and low, 140-150 K temperature. The valence band photoemission spectra measured reveal a simple metal-type valence band of icosahedral ZnMgEr with a distinct Fermi edge cut-off and with a sharp pseudogap feature. The photoemission spectra of shallow Mg 2p and Zn 3d core levels indicate a coordination shift of Mg 2p spin-orbit doublet and an oscillating dependence of Zn 3d photoemission line components on the photon energy within the hv = 20-160 eV range investigated. The optical response of icosahedral ZnMgEr, a dispersion of the dielectric function, was measured by the spectroscopic ellipsometry technique in the 0.5-5.0 eV spectral range. The optical spectra of the quasicrystal indicate the Drude-type optical response superimposed with a peak of interband optical transitions. The interband optical transitions can be modelled with the pseudogap parameters which agree with those deduced in an analysis of the photoemission valence band spectra.
Place, publisher, year, edition, pages
2005. Vol. 107, no 2, 412-419 p.
mg-zn, growth, alloy, tb
IdentifiersURN: urn:nbn:se:kth:diva-14565ISI: 000227308300039ScopusID: 2-s2.0-14644435795OAI: oai:DiVA.org:kth-14565DiVA: diva2:332606
QC 20100525 QC 20111011. 12th International Symposium on Ultrafast Phenomena in Semiconductors (12-UFPS). Vilnius, LITHUANIA. AUG 22-25, 20042010-08-052010-08-052011-10-11Bibliographically approved