Abstract
The results of photoemission study of icosahedral single-grain ZnMgEr quasicrystals are presented.Synchrotron radiation photoemission measurements were performed on in situ cleaved samples at10−10 mbar pressure and low, 140–150 K, temperature. The valence band photoemissionspectra measured reveal a simple-metal type valence band of i-ZnMgErwith a distinct Fermi edge cutoff and a spectral feature at 0.7 eV belowεF. Analysis of the PE spectra shows that the spectral feature observed corresponds to thevan Hove singularities in the density of states, which are due to intersections of the Fermisurface with the 222100 and 311111 Bragg planes.
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