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Düsseldorf 2007 – scientific programme

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A: Fachverband Atomphysik

A 4: Atomic Clusters II

A 4.3: Talk

Monday, March 19, 2007, 14:45–15:00, 6G

Magic Numbers and Superfluid Sizes in Small Para-Hydrogen Clusters — •Peter Toennies1, Saad Khairallah2, Mikhail Sevryuk1, and David Ceperley21Max Planck Institut für Dynamik und Selbstorganisation, D-37073 Göttingen — 2Dept. Physics, University of Illinois at Urbana-Champaign, IL 61801 USA

The Path Integral Monte Carlo method is used to study the low temperature structures and superfluidity of para-hydrogen clusters with up to 40 molecules. Clusters with sizes N<26 and T ≤ 1.5 K have nearly 100% superfluid fractions. In larger clusters superfluidity is quenched at the icosahedral-derived magic numbers N=26, 29, 32, and 37 found in "classical" rare gas ion clusters, while below 1 K superfluidity is recovered for the pairs (27,28), (30,31), and (35,36) with loosely attached outer molecules. In all the clusters superfluidity is largely localized in the surface thereby explaining the apparent "supersolid" behavior discussed in the past.

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