Superfluidity in CH4-doped H2 nanoclusters

We report a theoretical study of superfluidity in CH(4)-doped para-H(2) nanoclusters. Path integral simulations for clusters of 12-16 H(2) around a single CH(4) molecule were carried out at temperatures between 0.5 and 2 K to study the superfluid response of the cluster. The results indicate that a rapid increase in the superfluid response is expected to occur around 1 K. We analyzed the structures and statistics of these clusters and found that the larger permutation cycles which dominate the superfluid component tend to adopt ringlike structures on the surface of the CH(4) molecule.