Abstract
Critical phenomena of fluid metals are studied by observing the potential range of effective ion-ion interaction in their liquid phases. This is done by two different methods. First, the Fourier transform of March's potential with a cutoff is calculated. Secondly, by means of quantum mechanical perturbation theory, the effective potential is derived and discussed within the lowest order approximation for the electronic dielectric function. Both methods yield the result that the effective potential is of short-range from a viewpoint of critical phenomena. On the basis of ion-ion interaction obtained by the second method, a scaling form for the critical temperature is derived and examined by the use of existent experimental data.
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