Superfluidity of isotopically doped parahydrogen clusters

Abstract

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.

4 pages, 5 figures

References in corpus (4)

• Worm Algorithm and Diagrammatic Monte Carlo: A New Approach to Continuous-Space Path Integral Monte Carlo Simulations
• Worm Algorithm for Continuous-space Path Integral Monte Carlo Simulations
• Superfluidity and Quantum Melting of para-Hydrogen clusters
• Structure, superfluidity, and quantum melting of hydrogen clusters

Cited by in corpus (5)

• Local Superfluidity of Parahydrogen Clusters
• Microscopic molecular superfluid response: theory and simulations
• On the possible "supersolid" character of parahydrogen clusters
• Superfluid response of parahydrogen clusters in superfluid He-4
• Exchange-driven self-diffusion of nanoscale crystalline parahydrogen clusters on graphite