Heat Capacity of Liquid 4He Confined in a Nanoporous Glass
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We report a preliminary study of heat capacities of 4He confined in a nanoporous Gelsil glass that has nanopores of 2.5 nm in diameter. The heat capacity has a broad peak at a temperature far above the superfluid transition temperature obtained by torsional oscillator technique. The heat-capacity peak is attributed to formation of localized Bose-Einstein Condensates in the nanopores, in which the long-range superfluid coherence is destroyed by pore size distribution or random potential inherent to the porous glass.
KeywordsSuperfluidity Bose-Einstein condensation Quantum phase transition Porous media
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- 14.G.M. Zassenhaus, Ph.D. Thesis, Cornell University (1999) Google Scholar