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

Abstract

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.

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

References in corpus (1)

• Quantum phase transition from a superfluid to a Mott insulator in a gas of ultracold atoms

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• 4D-XY Superfluid Transition and Dissipation in ${}^4$He Confined in Nanoporous Media
• Evidence for 4D XY Quantum Criticality in ${}^4$He Confined in Nanoporous Media at Finite Temperatures
• Saga of Superfluid Solids
• Two liquid states of distinguishable helium-4: the existence of another non-superfluid frozen by heating
• Suppression of Superfluidity of ${}^4$He in a Nanoporous Glass by Preplating a Kr Layer