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Type: Journal article
Title: Persistent molecular superfluid response in doped para-hydrogen clusters
Author: Raston, P.
Jager, W.
Li, H.
Le Roy, R.
Roy, P.
Citation: Physical Review Letters, 2012; 108(25):253402-1-253402-5
Publisher: American Physical Society
Issue Date: 2012
ISSN: 0031-9007
Statement of
P. L. Raston, W. Jäger, H. Li, R. J. Le Roy, and P.-N. Roy
Abstract: Direct observation of superfluid response in para-hydrogen (p-H2) remains a challenge because of the need for a probe that would not induce localization and a resultant reduction in superfluid fraction. Earlier work [H. Li, R. J. Le Roy, P.-N. Roy, and A. R. W. McKellar, Phys. Rev. Lett. 105, 133401 (2010)] has shown that carbon dioxide can probe the effective inertia of p-H2 although larger clusters show a lower superfluid response due to localization. It is shown here that the lighter carbon monoxide probe molecule allows one to measure the effective inertia of p-H2 clusters while maintaining a maximum superfluid response with respect to dopant rotation. Microwave spectroscopy and a theoretical analysis based on Feynman path-integral simulations are used to support this conclusion.
Rights: © 2012 American Physical Society
DOI: 10.1103/PhysRevLett.108.253402
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