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

Keiichi Yamamoto, Yoshiyuki Shibayama, Keiya Shirahama

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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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ASJC Scopus subject areas

  • Physics and Astronomy(all)

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