Thermodynamic evidence for nanoscale bose-einstein condensation in He4 confined in nanoporous media

Keiichi Yamamoto, Yoshiyuki Shibayama, Keiya Shirahama

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34 Citations (Scopus)

Abstract

We report the measurements of the heat capacity of He4 confined in nanoporous Gelsil glass that has nanopores of 2.5-nm diameter at pressures up to 5.3 MPa. The heat capacity has a broad peak at a temperature much higher than the superfluid transition temperature obtained using the torsional oscillator technique. The peak provides definite thermodynamic evidence for the formation of localized Bose-Einstein condensates on nanometer length scales. The temperature dependence of the heat capacity is described well by the excitations of phonons and rotons, supporting the existence of localized Bose-Einstein condensates.

Original languageEnglish
Article number195301
JournalPhysical Review Letters
Volume100
Issue number19
DOIs
Publication statusPublished - 2008 May 15

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condensation
specific heat
Bose-Einstein condensates
thermodynamics
rotons
phonons
transition temperature
oscillators
temperature dependence
glass
excitation

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Thermodynamic evidence for nanoscale bose-einstein condensation in He4 confined in nanoporous media. / Yamamoto, Keiichi; Shibayama, Yoshiyuki; Shirahama, Keiya.

In: Physical Review Letters, Vol. 100, No. 19, 195301, 15.05.2008.

Research output: Contribution to journalArticle

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