Optical conductivity of Al-Cr-Fe approximant compounds

Demange, Valérie; Milandri, A.; Weerd, M.-C. de; Machizaud, F.; Jeandel, G.; Dubois, Jean‐Marie

doi:10.1103/physrevb.65.144205

Cited by 42 publications

(40 citation statements)

References 28 publications

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“…It presents an intense, broad and practically featureless (except for maximum) band occupying virtually the all range of frequencies from 40 up to 25,000 cm −1 . A number of authors have reported the existence of the similar bands in various icosahedral systems: AlPdMn [40], AlMnSi [41], AlPdRe [42], and AlCuFeB [43]. Accordingly, there exist three possible explanations for the band.…”

Section: Two-level Excitations and Optical Spectramentioning

confidence: 97%

“…Accordingly, there exist three possible explanations for the band. It may be associated with strong scattering of electrons and then the maximum occurs at ω = 1/τ [44]; it may be associated with the direct gap in the zone structure and then σ(ω) = const x(ω − Eg) 1/2 /ω [42]; and, finally, it may be associated with resonance absorption [43] in the form of:…”

Section: Two-level Excitations and Optical Spectramentioning

confidence: 99%

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Two-Level Electron Excitations and Distinctive Physical Properties of Al-Cu-Fe Quasicrystals

Prekul

Shchegolikhina

2016

Crystals

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This article is not a review in the conventional sense. Rather, it is a monographic study of the implications of detection in Al-Cu-Fe quasicrystals of the electronic heat capacity contributions associated with the two-level electron excitations. Our aim was to reveal correlations between these contributions, on the one hand, and specific features of electron transport, magnetic susceptibility, Hall-effect, tunnelling and optical spectra, on the other hand. It is shown that the full range of these features can be understood in the framework of the unified conceptual scheme based on two-level electron excitations.

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Section: Two-level Excitations and Optical Spectramentioning

confidence: 97%

Section: Two-level Excitations and Optical Spectramentioning

confidence: 99%

Two-Level Electron Excitations and Distinctive Physical Properties of Al-Cu-Fe Quasicrystals

Prekul

Shchegolikhina

2016

Crystals

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“…This property of PA+QC is unique and justies the usage of quasicrystal powder. Its origin is related to the specic electronic properties of quasicrystals, owing to the absence of periodicity that cancels the Drude peak normally observed at low frequencies on the optical conductivity of a metal [11]. As a result, the absorption of infrared (IR) light is much higher in a quasicrystal compared to that in a metal like steel or an aluminium alloy.…”

Section: Selective Laser Sintering We Use An Industrial Devicementioning

confidence: 99%

Quasicrystal-Polymer Composites for Additive Manufacturing Technology

et al. 2014

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We present a new niche application of quasicrystalline powders that leads to a commercially successful development of polymer-matrix composites. The process is based upon selective laser sintering, which is one of the current most powerful additive manufacturing technologies in use in the mechanical industries. Characteristics of the materials produced, such as porosity, friction and wear against hard steel, are evaluated and compared to the state of the art. Insight into the production of metal-matrix composites, using a variant of the technology, is also given.

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“…Optical studies of icosahedral Al-Mn, 1 Al-Cu-Fe, 2 Al-Cu-Fe-B, 3 Al-Pd-Mn, [3][4][5] Al-Pd-Re, [6][7][8] and AlMn-Si 9 quasicrystals reveal the main features of their optical spectra to be the broad absorption peak at about 1-2 eV and a strong suppression of the usual metallic Drude-type optical transitions. Investigations of decagonal quasicrystalline AlCo-Cu, 10 Al-Co-Cu-Si, 10 and Al-Ni-Co 11 phases show an essential reduction of the Drude-type response in the plane of quasicrystalline atomic arrangement as compared to the optical response in the periodic, crystalline direction.…”

Section: Introductionmentioning

confidence: 99%

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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Optical conductivity of Al-Cr-Fe approximant compounds

Cited by 42 publications

References 28 publications

Two-Level Electron Excitations and Distinctive Physical Properties of Al-Cu-Fe Quasicrystals

Two-Level Electron Excitations and Distinctive Physical Properties of Al-Cu-Fe Quasicrystals

Quasicrystal-Polymer Composites for Additive Manufacturing Technology

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

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