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- W1967745895 abstract "We present a comprehensive study of plasmon dispersions in simple metals and Heusler compounds based on an accurate ab-initio evaluation of the momentum and frequency dependent dielectric function in the random-phase approximation. Using a momentum-dependent tetrahedron method for the computation of the dielectric function, we extract and analyze full and intraband plasmon dispersions: The full plasma dispersion is obtained by including all bands, the intraband plasma dispersion by including only intraband transitions. For the simple metals silver and alu- minum, we show that the intraband plasmon dispersion has an unexpected downward slope and is therefore markedly different from the results of an effective-mass electron-gas model and the full plasmon dispersion. For the two Heusler compounds Co2FeSi and Co2MnSi, we present spectra for the dielectric function, their loss functions and plasmon dispersions. The latter exhibit the same negative intraband plasmon dispersion as found in the simple metals. We also discuss the influence of spin-mixing on the plasmon dispersion." @default.
- W1967745895 created "2016-06-24" @default.
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- W1967745895 date "2013-07-22" @default.
- W1967745895 modified "2023-10-06" @default.
- W1967745895 title "Plasmon dispersions in simple metals and Heusler compounds" @default.
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- W1967745895 doi "https://doi.org/10.1103/physrevb.88.045124" @default.
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