Superfluidity of isotopically doped parahydrogen clusters

Details Superfluidity of isotopically doped parahydrogen clusters Superfluidity of isotopically doped parahydrogen clusters

2007-08-09

arxiv.org/abs/0708.1315v1

Phys. Rev. A 76, 021201 (2007)

Physics

Condensed Matter

Statistical Mechanics

4 pages, 5 figures

Scientific paper

10.1103/PhysRevA.76.021201

It is shown by computer simulations that superfluid {\it para}-hydrogen clusters of more than 22 molecules can be turned insulating and "solidlike" by the replacement of as few as one or two molecules, with ones of the heavier {\it ortho}-deuterium isotope. A much smaller effect is observed with substitutional {\it ortho}-hydrogen. Substitutional {\it ortho}-deuterium molecules prevalently sit in the inner part of the cluster, whereas {\it ortho}-hydrogen impurities reside primarily in the outer shell, near the surface. Implications on the superfluidity of pure {\it para}-hydrogen clusters are discussed.

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