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Photoemission and Optical Spectroscopy of i-ZnMgEr Quasicrystal

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Suchodolskis A., Assmus W., Babonas G., Giovanelli L., Karlsson U., Karpus V., Le Lay G., Rėza A., Uhrig E.

Acta Physica Polonica A

2005

vol. 107

issue 2

412-419

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 hν=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.

Optical Response of fci-ZnMgHo Quasicrystal

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Karpus V., Babonas G., Rėza A., Suchodolskis A., Tumėnas S., Hunderi O., Assmus W., Brűhne S.

Acta Physica Polonica A

2008

vol. 113

issue 3

1005-1008

The results of an optical spectroscopy study of the icosahedral fci-ZnMgHo quasicrystal are presented. The dielectric function of the quasicrystal was measured by the spectroscopic ellipsometry technique in the spectral range of 0.1-5.0 eV. The analysis of the dielectric function shows that an optical response of fci-ZnMgHo is a superposition of the free-electron Drude-type contribution and that of the interband transitions across the fci-ZnMgHo pseudogap.

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2 Acta Physica Polonica A

1 2008

1 2005

2 Assmus W.

2 Babonas G.

2 Karpus V.

2 Rėza A.

2 Suchodolskis A.

1 Brűhne S.

1 Giovanelli L.

1 Hunderi O.

1 Karlsson U.

1 Le Lay G.

1 Tumėnas S.

1 Uhrig E.

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Photoemission and Optical Spectroscopy of i-ZnMgEr Quasicrystal

Optical Response of fci-ZnMgHo Quasicrystal