Liquid Ge: A strongly coupled liquid with negligible bridge contributions to the structure factor

Abstract

Using a simple free-electron model for liquid Ge and the modified hypernetted-chain fitting method [Phys. Rev. B 28, 1701 (1983)] we obtain an electron-ion pseudopotential $V_{\mathrm{sp}}$ and an ion-ion potential for liquid Ge. The calculation accurately reproduces the experimental structure factor S(k${)}_{\mathrm{expt}}$ including the shoulder on the first peak, irrespective of the magnitude of the bridge contribution used. The appearance of the shoulder structure in S(k) is discussed in terms of the compressibility and the electron-density parameter $r_s^{\mathrm{*}}$. .AE