We extend our previously developed Ginzburg-Landau theory for calculating the crystal-melt interfacial tension of bcc elements to treat the classical one-component plasma (OCP), the charged fermion system, and the Bose crystal. For the OCP, a direct application of the theory of Shih et al. [Phys. Rev. A 35, 2611 (1987)] yields for the surface tension =1.12×10-3(Z2e2/a3), where Ze is the ionic charge and a is the radius of the ionic sphere. For the fermion system, the absence of reliable correlation functions near the coexistence line makes it difficult to estimate the surface tension. We treat the Bose crystal-melt interface by a quantum extension of the classical density-functional theory, using the Feynman formalism to estimate the relevant correlation functions. The theory is applied to the metastable He4 solid-superfluid interface at T=0, with a resulting surface tension 0.085 erg/cm2, in reasonable agreement with the value extrapolated from the measured surface tension of the bcc solid in the range 1.46 1.76 K. These results suggest that the density-functional approach is a satisfactory mean-field theory for estimating the equilibrium properties of liquid-solid interfaces, given knowledge of the uniform phases.
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics