Optical conductivity of the stable icosahedral quasicrystal Al63.5Cu24.5Fe12

Optical conductivity of the stable icosahedral quasicrystal Al63.5Cu24.5Fe12

The optical properties of the stable icosahedral quasicrystal Al63.5Cu24.5Fe12 have been measured from 40-25 000 cm exp --1 at 300 and at 80K. Unlike metallic glasses with a Drude spectrum with strong elastic scattering by disorder, or semiconductors with a conductivity gap, the optical conductivity...

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Veröffentlicht in:Physical review letters 1991-11, Vol.67 (19), p.2694-2696
Hauptverfasser: HOMES, C. C, TIMUSK, T, WU, X, ALTOUNIAN, Z, SAHNOUNE, A, STRÖM-OLSEN, J. O
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Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Optical constants: refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Optical properties of bulk materials and thin films
Physics
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container_end_page 2696
container_issue 19
container_start_page 2694
container_title Physical review letters
container_volume 67
creator HOMES, C. C
TIMUSK, T
WU, X
ALTOUNIAN, Z
SAHNOUNE, A
STRÖM-OLSEN, J. O
description The optical properties of the stable icosahedral quasicrystal Al63.5Cu24.5Fe12 have been measured from 40-25 000 cm exp --1 at 300 and at 80K. Unlike metallic glasses with a Drude spectrum with strong elastic scattering by disorder, or semiconductors with a conductivity gap, the optical conductivity of this quasicrystal is distinctive: starting from the very low dc value, it increases linearly with frequency well into the near infrared. A prominent peak in the conductivity is observed at 245 cm exp --1 ; its position and strength suggest that it arises from a direct excitation of phonons.
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subjects Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Optical constants: refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Optical properties of bulk materials and thin films
Physics
title Optical conductivity of the stable icosahedral quasicrystal Al63.5Cu24.5Fe12
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