TY - JOUR
T1 - Thermodynamic evidence for nanoscale bose-einstein condensation in He4 confined in nanoporous media
AU - Yamamoto, Keiichi
AU - Shibayama, Yoshiyuki
AU - Shirahama, Keiya
PY - 2008/5/15
Y1 - 2008/5/15
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevLett.100.195301
DO - 10.1103/PhysRevLett.100.195301
M3 - Article
AN - SCOPUS:43849107459
SN - 0031-9007
VL - 100
JO - Physical Review Letters
JF - Physical Review Letters
IS - 19
M1 - 195301
ER -