Phase diagram of second layer of helium adsorbed on graphite

Details Phase diagram of second layer of helium adsorbed on graphite Phase diagram of second layer of helium adsorbed on graphite

1998-02-16

arxiv.org/abs/cond-mat/9802173v2

Phys. Rev. Lett. 81, 156 (1998)

Physics

Condensed Matter

4 pages, revtex, 4 postscript figures; minor corrections to text, figures. Accepted for publication in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.81.156

Using realistic helium-helium and helium-graphite interactions and the path integral Monte Carlo method, we are able to identify the gas, superfluid liquid, commensurate-solid, and incommensurate-solid phases, and the coexistence regions between them, for the second layer of helium on graphite. The phase boundaries and the specific heat that we determine are in good agreement with experiment. The appearance and disappearance of superfluidity with increasing coverage can be explained by the growth of coexistence phases, as was observed by torsional oscillator experiments.

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