Semiempirical local-field correction function for electrons in Li metal

Abstract

A frequency average of the complex local-field correction function ͑LFCF͒, G(q,), of electrons in Li metal has been semiempirically determined for 1.12k F рqр2.59k F (k F ϭFermi momentum͒ by fitting experimental dynamic structure factors, S(q,), to jellium S(q,). The range of frequency averaging was between 3 and 4 eV ͑fitting range͒, its position was in the low-frequency region between 3 and 9 eV, depending on q. For qϽ1.6k F , the real part of the semiempirical LFCF, ReG(q,), is consistent with all current theories, when compared with the static LFCF G(q,ϭ0). For qϾ1.6k F , the semiempirical ReG(q,) exhibits a strong increase in values ranging from 1.2 to 2.4 in a manner which has not been predicted by any existing theory. The relation between G(q,0) and the momentum distribution function n(k) is stressed to make contact with a most recently found anomalous behavior of n(k) in Li. ͓S0163-1829͑96͒09647-6͔

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