Liquid-Solid Transition and Phase Diagram of ^4He Confined in Nanoporous Glass

Details Liquid-Solid Transition and Phase Diagram of ^4He Confined in Nanoporous Glass Liquid-Solid Transition and Phase Diagram of ^4He Confined in Nanoporous Glass

2007-07-18

arxiv.org/abs/0707.2683v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures, submitted to J. Phys. Soc. Jpn

Scientific paper

We have studied the liquid - solid (L-S) phase transition of ^4He confined in nanoporous glass, which has interconnected nanopores of 2.5 nm in diameter. The L-S boundary is determined by the measurements of pressure and thermal response during slow cooling and warming. Below 1 K, the freezing pressure is elevated to 1.2 MPa from the bulk freezing pressure, and appears to be independent of temperature. The T-independent L-S boundary implies the existence of a localized Bose-Einstein condensation state, in which long-range superfluid coherence is destroyed by narrowness of the nanopores and random potential.

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