Persistent Molecular Superfluid Response in Doped Para-Hydrogen Clusters

P. L. Raston, W. Jäger, H. Li, R. J. Le Roy, and P.-N. Roy
Phys. Rev. Lett. 108, 253402 – Published 19 June 2012
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Abstract

Direct observation of superfluid response in para-hydrogen (pH2) 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 pH2 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 pH2 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.

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  • Received 31 July 2011

DOI:https://doi.org/10.1103/PhysRevLett.108.253402

© 2012 American Physical Society

Authors & Affiliations

P. L. Raston1, W. Jäger1,*, H. Li2,3, R. J. Le Roy2, and P.-N. Roy2,†

  • 1Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada
  • 2Department of Chemistry, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
  • 3Institute of Theoretical Chemistry, State Key Laboratory of Theoretical and Computational Chemistry, Jilin University, 2519 Jiefang Road, Changchun 130023, People’s Republic of China

  • *wolfgang.jaeger@ualberta.ca
  • pnroy@uwaterloo.ca

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Issue

Vol. 108, Iss. 25 — 22 June 2012

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