Author/Authors :
A. Suchodolskis، نويسنده , , W. Assmus and F. Ritter ، نويسنده , , B. ?echavi?ius، نويسنده , , J. Dalmas، نويسنده , , L. Giovanelli، نويسنده , , M. G?thelid، نويسنده , , U.O. Karlsson، نويسنده , , V. Karpus، نويسنده , , G. Le Lay، نويسنده , , R. Sterzel، نويسنده , , Robert E. Uhrig، نويسنده ,
Abstract :
The results of a photoemission study of icosahedral single-grain ZnMg(Y, Ho) quasicrystals and their crystalline approximant Zn2Mg are presented. Synchrotron radiation photoemission measurements have been performed on in situ cleaved samples at low temperature of ≈90 K and 10−10 mbar pressure. The spectra obtained indicate simple metal-type valence bands (VB) with distinct Fermi edge cutoff. Analysis of the Fermi edge spectra reveals the presence of a pseudogap in i-ZnMg(Y, Ho) quasicrystals. The pseudogap corresponds to a rather sharp DOS dip at the Fermi level with the ≈50% (of the normal DOS) depth and the ≈0.8 eV width. The values of i-ZnMg(Y, Ho) pseudogap parameters are comparable with those of other quasicrystals.
