Superfluidity of He4 confined in nanoporous media

Keiya Shirahama, K. Yamamoto, Y. Shibayama

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

We have examined superfluid properties of He4 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)273-278
Number of pages6
JournalLow Temperature Physics
Volume34
Issue number4
DOIs
Publication statusPublished - 2008

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superfluidity
phase diagrams
specific heat
phase coherence
solid phases
condensation
transition temperature
oscillators
temperature
glass

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Superfluidity of He4 confined in nanoporous media. / Shirahama, Keiya; Yamamoto, K.; Shibayama, Y.

In: Low Temperature Physics, Vol. 34, No. 4, 2008, p. 273-278.

Research output: Contribution to journalArticle

Shirahama, Keiya ; Yamamoto, K. ; Shibayama, Y. / Superfluidity of He4 confined in nanoporous media. In: Low Temperature Physics. 2008 ; Vol. 34, No. 4. pp. 273-278.
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