Valence band structure of i-ZnMgEr quasicrystal: photoemission study

Suchodolskis, A.; Aßmus, W.; Giovanelli, Luca; Karlsson, Ulf O.; Karpus, V.; Lay, G. Le; Uhrig, E.

doi:10.1088/0953-8984/16/50/004

Cited by 8 publications

(12 citation statements)

References 8 publications

(9 reference statements)

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“…Similar multiplet features originating from Ho 4f states have been observed at about 6 eV in Zn-Mg-Ho. 26 Such features are absent in Zn-Mg-Y ( Fig. 1(b)) since Y is a 4d metal with 4d 1 5s 2 configuration.…”

Section: Resultsmentioning

confidence: 97%

Bulk electronic structure of Zn-Mg-Y and Zn-Mg-Dy icosahedral quasicrystals

et al. 2015

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We use bulk sensitive hard x-ray photoelectron spectroscopy to provide unambiguous evidence for a pseudogap in the density of states around the Fermi level in icosahedral Zn-Mg-Y and Zn-Mg-Dy quasicrystals, in agreement with our density functional theory calculations. The pseudogap in these Zn-based quasicrystals is less pronounced compared to the Al-based ones such as Al-Pd-Mn and AlCu-Fe [J. Nayak et al., Phys. Rev. Lett. 109, 216403 (2012)]. This observation is in agreement with transport studies that indicate a larger charge carrier concentration in the Zn-based quasicrystals. Compared to Zn-Mg-Dy, the pseudogap is somewhat deeper in Zn-Mg-Y. The larger width of the Mg 1s and Zn 2p core-level spectra in Zn-Mg-Y is explained by different configurations of the local atomic surrounding compared to Zn-Mg-Dy.

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Section: Resultsmentioning

confidence: 97%

Bulk electronic structure of Zn-Mg-Y and Zn-Mg-Dy icosahedral quasicrystals

et al. 2015

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“…The electronic structure of face-centred icosahedral (fci) ZnMgRE (RE = Y, Ho, Er) quasicrystals was recently examined by the photoemission (PE) spectroscopy technique [1,2]. Analysis of the PE response reveals that the electron energy spectrum of the quasicrystals near the Fermi level is determined by intersections of the isoenergetic surface with the 222100 and 311111 Bragg planes, which make up the effective Brillouin zone.…”

Section: Introductionmentioning

confidence: 99%

Optical Response of fci-ZnMgHo Quasicrystal

Karpus¹,

Babonas²,

Rėza³

et al. 2008

Acta Phys. Pol. A

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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 fciZnMgHo pseudogap.

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“…In our previous Zn-Mg-R PE studies, [16][17][18] the bandstructure hypothesis approach was successfully applied for an analysis of the valence-band PE spectra. The Zn-Mg-R valence-band density of states was calculated in the framework of the NFE approximation and the calculated DOS nicely reproduced the observed PE valence-band spectra.…”

Section: Model Of Electron Energy Spectrummentioning

confidence: 99%

“…5(a) for the {g 222100 ,g 222001 ,g 222010 } triad around g 222000 C 3 . The 72 g ∈ G vectors determine the effective Brillouin zone of Zn-Mg-R quasicrystals, 16,17 the faces of which correspond to the g ∈ G Bragg planes [ Fig. 5(b)].…”

Section: A Nfe Approximationmentioning

confidence: 99%

“…[16][17][18] On the basis of the PE data analysis, a model for the Zn-Mg-R electron energy spectrum was suggested, 16 which allowed for a successful description of the experimental Zn-Mg-R valence band PE spectra. The model is based on a band structure hypothesis and treats the Zn-Mg-R electronic subsystem as a nearly free-electron (NFE) gas, affected by a weak quasicrystalline potential.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2013

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Results of optical spectroscopy studies of the face-centered icosahedral (fci) single-grain Zn-Mg-Y, Zn-Mg-Ho, and Zn-Mg-Er quasicrystals (QCs) are presented. The dielectric function of the QCs was measured in the 0.01-6 eV spectral range by IR-UV spectroscopic ellipsometry and far infrared reflection spectroscopy techniques. A theoretical scheme of optical conductivity calculations is extended to account for the Fermi level positions within 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.

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Valence band structure of i-ZnMgEr quasicrystal: photoemission study

Cited by 8 publications

References 8 publications

Bulk electronic structure of Zn-Mg-Y and Zn-Mg-Dy icosahedral quasicrystals

Bulk electronic structure of Zn-Mg-Y and Zn-Mg-Dy icosahedral quasicrystals

Optical Response of fci-ZnMgHo Quasicrystal

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

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