Optical absorption in Al and dilute alloys of Mg and Li in Al at 4.2 K | Zendy

Ralph Lawrence Benbow | Zendy; D. W. Lynch | Zendy

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Optical absorption in Al and dilute alloys of Mg and Li in Al at 4.2 K

Author(s) -

Ralph Lawrence Benbow,

D. W. Lynch

Publication year - 1975

Publication title -

physical review. b, solid state

Language(s) - English

Resource type - Journals

ISSN - 0556-2805

DOI - 10.1103/physrevb.12.5615

Subject(s) - pseudopotential , materials science , condensed matter physics , relaxation (psychology) , absorption (acoustics) , type (biology) , range (aeronautics) , crystal (programming language) , optical conductivity , drude model , electrical resistivity and conductivity , thermodynamics , physics , atomic physics , quantum mechanics , psychology , social psychology , ecology , composite material , biology , programming language , computer science

The absorptances of Al and alloys of up to 5.5 at. percent of Li and Mg in Al were measured at 4.2/sup 0/K in the 0.2 to 3.0-eV range. The theory of Ashcroft and Sturm was fitted to the data. The fit obtained is reasonably good, provided three relaxation times are used, one for the Drude term and one for each type of transition between parallel bands. The fit is slightly better for the more concentrated alloys. In all cases the discrepancy between the fit and the data is greatest in the region between the two interband peaks in the optical conductivity, and known extensions to the theory do not qualitatively improve the fit. Pesudopotential Fourier coefficients U/sub 200/ and U/sub 111/ obtained from the fits vary with solute type and concentration. The variation can be explained semiquantitatively with a virtual-crystal pseudopotential. (auth)

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