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Superfluidity of metastable glassy bulk para-hydrogen at low temperature

  Articoli su Riviste JCR/ISI  (anno 2012)

Autori:  Osychenko O.N., Rota R., Boronat J

Affiliazione Autori:  Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya, Campus Nord B4-B5, E-08034, Barcelona, Spain; Dipartimento di Fisica, Università di Trento and INO-CNR BEC Center, I-38123 Povo, Trento, Italy

Riassunto:  Molecular para-hydrogen (p-H-2) has been proposed theoretically as a possible candidate for superfluidity, but the eventual superfluid transition is hindered by its crystallization. In this work, we study a metastable noncrystalline phase of bulk p-H-2 by means of the path integral Monte Carlo method in order to investigate at which temperature this system can support superfluidity. By choosing accurately the initial configuration and using a noncommensurate simulation box, we have been able to frustrate the formation of the crystal in the simulated system and to calculate the temperature dependence of the one-body density matrix and of the superfluid fraction. We observe a transition to a superfluid phase at temperatures around 1 K. The limit of zero temperature is also studied using the diffusion Monte Carlo method. Results for the energy, condensate fraction, and structure of the metastable liquid phase at T = 0 are reported and compared with the ones obtained for the stable solid phase.

Rivista/Giornale:  PHYSICAL REVIEW B
Volume n.:  85 (22)      Pagine da: 224513  a: 224513
Ulteriori informazioni:  The authors acknowledge partial financial support from the DGI (Spain) Grant No. FIS2011-25275 and Generalitat de Catalunya Grant No. 2009SGR-1003.
DOI: 10.1103/PhysRevB.85.224513

*Impact Factor della Rivista: (2012) 3.767   *Citazioni: 17
data tratti da "WEB OF SCIENCE" (marchio registrato di Thomson Reuters) ed aggiornati a:  19/05/2019

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