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- W4249222212 abstract "The bonding character in the filled tetrahedral semiconductor LiZnAs (space group, $F4ensuremath{-}3m$), which can be naturally interpreted as a zinc-blende-like ${(mathrm{Zn}mathrm{As})}^{ensuremath{-}}$ lattice stoichiometrically filled with He-like ${mathrm{Li}}^{+}$ interstitials, is studied using a Raman-scattering method. Two longitudinal-optical (LO) and transverse-optical (TO) phonons at $mathbf{k}ensuremath{sim}0$ ($ensuremath{Gamma}$ point) for Li-As and Zn-As pairs are observed at 452 and $420phantom{rule{0.3em}{0ex}}{mathrm{cm}}^{ensuremath{-}1}$ and 233 and $204phantom{rule{0.3em}{0ex}}{mathrm{cm}}^{ensuremath{-}1}$, respectively. The macroscopic transverse effective charge $e_{T}{}^{*}$ estimated from the separation of the LO and TO branches at $mathbf{k}ensuremath{sim}0$ for Li-As pair is less than that for Zn-As pair, showing the relatively high ionicity of the Li-As bond, whereas the force constant of Zn-As is about 23% higher than that of Li-As, showing the relatively high covalency of Zn-As bond. In comparison with the $e_{T}{}^{*}$ values of Zn-As bond in LiZnAs and Ga-As bond in GaAs, the covalency of Zn-As bond is comparable with that of Ga-As bond." @default.
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- W4249222212 date "2005-12-05" @default.
- W4249222212 modified "2023-09-30" @default.
- W4249222212 title "Raman scattering from the filled tetrahedral semiconductor LiZnAs" @default.
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- W4249222212 doi "https://doi.org/10.1103/physrevb.72.233201" @default.
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