Superfluidity of4He confined in nanoporous media

Keiya Shirahama, Keiichi Yamamoto, Yoshiyuki Shibayama

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


We have examined superfluid properties of He confined to a nanoporous Gelsil glass that has nanopores 2.5 nm in diameter. The pressure-temperature phase diagram was determined by torsional oscillator, heat capacity and pressure studies. The superfluid transition temperature Tc approaches zero at 3.4 MPa, indicating a novel quantum superfluid transition. By heat capacity measurements, the nonsuperfluid phase adjacent to the superfluid and solid phases is identified to be a nanometer-scale, localized Bose condensation state, in which global phase coherence is destroyed. At high pressures, the superfluid density has a T-linear term, and Tc is proportional to the zero-temperature superfluid density. These results strongly suggest that phase fluctuations in the superfluid order parameter play a dominant role on the phase diagram, and superfluid properties.

Original languageEnglish
Pages (from-to)350-356
Number of pages7
JournalFizika Nizkikh Temperatur
Issue number4-5
Publication statusPublished - 2008 Apr


  • Nanoporous glass
  • Superfluid transition
  • Torsional oscillator

ASJC Scopus subject areas

  • General Physics and Astronomy


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