Superfluidity and Quantum Melting of para-Hydrogen clusters

Details Superfluidity and Quantum Melting of para-Hydrogen clusters Superfluidity and Quantum Melting of para-Hydrogen clusters

2006-03-24

arxiv.org/abs/cond-mat/0603677v7

Phys. Rev. Lett. 97, 045301 (2006)

Physics

Condensed Matter

Statistical Mechanics

Scientific paper

10.1103/PhysRevLett.97.045301

Structural and superfluid properties of para-Hydrogen clusters of size up to N=40 molecules, are studied at low temperature (0.5 K < T < 4 K) by Path Integral Monte Carlo simulations. The superfluid fraction displays an interesting, non-monotonic behavior for 22 < N < 30. We interpret this dependence in terms of variations with N of the cluster structure. Superfluidity is observed at low T in clusters of as many as 27 molecules; in the temperature range considered here, quantum melting is observed in some clusters, which freeze at high temperature.

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