Optical spectroscopy and electronic structure of the face-centered icosahedral quasicrystals Zn-Mg-R (R=Y, Ho, Er)

Content Provider	Semantic Scholar
Author	Karpus, Vytas Tumenas, Saulius Suchodolskis, Artūras Arwin, Hans Assmus, Wolf
Copyright Year	2013
Abstract	Resultsofopticalspectroscopystudiesoftheface-centeredicosahedral(fci)single-grainZn-Mg-Y,Zn-Mg-Ho, and Zn-Mg-Er quasicrystals (QCs) are presented. The dielectric function of the QCs was measured in the 0.01‐6eVspectralrangebyIR-UVspectroscopicellipsometryandfarinfraredreflectionspectroscopytechniques. AtheoreticalschemeofopticalconductivitycalculationsisextendedtoaccountfortheFermilevelpositionswithin and below a pseudogap. The model of the QC electron energy spectrum, based on a band structure hypothesis, is suggested, which treats the electronic subsystem as a nearly free electron gas affected by intersections of the Fermi surface with several families of Bragg planes. The experimental optical spectra are reproduced in detail by theoretical calculations carried out within the framework of the model. The parameters of the electron energy spectrum deduced from an analysis of optical data are close to those previously determined in an analysis of fci Zn-Mg-R valence band photoemission spectra.
File Format	PDF HTM / HTML
DOI	10.1103/PhysRevB.88.094201
Volume Number	88
Alternate Webpage(s)	http://liu.diva-portal.org/smash/get/diva2:655269/FULLTEXT01.pdf
Alternate Webpage(s)	https://doi.org/10.1103/PhysRevB.88.094201
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article