Details

Autor(en) / Beteiligte

• Raston, P L
• Jäger, W
• Li, H
• Le Roy, R J
• Roy, P-N

Titel

Persistent molecular superfluid response in doped para-hydrogen clusters

Ist Teil von

• Physical review letters, 2012-06, Vol.108 (25), p.253402-253402, Article 253402

Ort / Verlag

United States

Erscheinungsjahr

2012

Quelle

American Physical Society Journals

Beschreibungen/Notizen

• Direct observation of superfluid response in para-hydrogen (p-H(2)) 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-H(2) 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-H(2) 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.