Authors: Byeongjoon Kim Yongkyung Kwon
Publish Date: 2012/09/19
Volume: 171, Issue: 5-6, Pages: 599-605
Abstract
We have performed pathintegral Monte Carlo calculations to study the adsorption of N 4He atoms on a single C28 fullerene molecule Radial density distributions show a layerbylayer growth of 4He with the first adlayer being located at a distance of 53 Å from the center of C28 The monolayer is found to show a commensurate structure at N=16 with each of the 16 adsorption sites on the molecular surface being occupied by one 4He atom As more helium atoms are adsorbed beyond N=16 the adlayer is in a mixed state consisting of 4 localized atoms at the hexagonal faces and the other atoms delocalized over the pentagonal faces Another structurallyordered state is observed at N=32 where the helium layer shows the same crystalline structure with an icosahedral symmetry as observed for 32 4He atoms on a C60 molecule It is found that more 4He atoms can be squeezed into the first layer to disrupt this icosahedral structure when enough 4He atoms are added in the second layer Finally we observe the reentrant superfluid response of the monolayer with superfluidity being quenched completely at the ordered states of N=16 and 32
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