Inherent structures in the potential energy landscape of solid 4He

摘要: We study the potential energy landscape (many‐atom as a function of atomic positions) solid hcp 4He in vicinity 0 K crystal structure using an accurate pair potential. At melting point, helium lattice is far above minimum interatomic energy. confirm previous conclusions (based on less potentials) that all classical phonon frequencies at pressure are imaginary, indicating melting‐point corresponds to local maximum landscape; about 1300 bar, however, makes it minimum. find arrangements lie minima (‘‘inherent structures’’) glassy and porous, have much lower than crystalline form same density. quantitatively characterized structures by their radial distribution functions coordination number distributions; they qualitatively resemble inherent for monatomic liquids, but exhibit differences detail. A model variational calculation has been carried out melting‐density ground state. It utilizes separate basis each structures, predicts large Lindemann ratio crystal, indicates probability perfect configuration.