Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2006-11-30
Phys. Rev. A 75, 033201 (2007)
Physics
Condensed Matter
Statistical Mechanics
11 pages, 16 figures
Scientific paper
10.1103/PhysRevA.75.033201
We present results of a theoretical study of para-hydrogen and ortho-deuterium clusters at low temperature (0.5 K < T < 3.5 K), based on Path Integral Monte Carlo simulations. Clusters of size up to N=21 para-hydrogen molecules are nearly entirely superfluid at T < 1 K. For 21 < N < 30, the superfluid response displays strong variations with N, reflecting structural changes that occur on adding or removing even a single molecule. Some clusters in this size range display quantum melting, going from solid- to liquid-like as T tends to 0. Melting is caused by quantum exchanges of molecules. The largest para-hydrogen cluster for which a significant superfluid response is observed comprises 27 molecules. Evidence of a finite superfluid response is presented for ortho-deuterium clusters of size up to 14 molecules. Magic numbers are observed, at which both types of clusters feature pronounced stability.
Boninsegni Massimo
Mezzacapo Fabio
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