Three-body exchange interaction in dense helium

4 May 1987

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 58 (18) , 1857-1860
https://doi.org/10.1103/physrevlett.58.1857

Abstract

Self-consistent phonon and Monte Carlo calculations show that the three-body exchange interaction is important in dense helium. Together with a realistic pair potential and the Axilrod-Teller three-body dispersion interaction, it brings calculations into agreement with the experimental equation of state. This interaction stabilizes the hcp structure for pressures greater than about 60 GPa. A speculative phase diagram of high-pressure helium is proposed.

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