Superfluidity of ⁴He confined in nanoporous media

• Veröffentlicht in: Физика низких температур
• Datum: 2008
• Hauptverfasser: Shirahama, K., Yamamoto, K., Shibayama, Y.
• Format: Artikel
• Sprache: Englisch
• Veröffentlicht: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 2008
• Schlagworte: Жидкий гелий
• Online Zugang: https://nasplib.isofts.kiev.ua/handle/123456789/116915
• Назва журналу: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Zitieren: Superfluidity of ⁴He confined in nanoporous media / K. Shirahama, K. Yamamoto, Y. Shibayama // Физика низких температур. — 2008. — Т. 34, № 4-5. — С. 350–356. — Бібліогр.: 30 назв. — англ.

We have examined superfluid properties of ⁴He confined to a nanoporous Gelsil glass that has nanopores
 2.5 nm in diameter. The pressure–temperature phase diagram was determined by torsional oscillator, heat
 capacity and pressure studies. The superfluid transition temperature Tc approaches zero at 3.4 MPa, indicating
 a novel quantum superfluid transition. By heat capacity measurements, the nonsuperfluid phase adjacent
 to the superfluid and solid phases is identified to be a nanometer-scale, localized Bose condensation state, in
 which global phase coherence is destroyed. At high pressures, the superfluid density has a T-linear term, and
 Tc is proportional to the zero-temperature superfluid density. These results strongly suggest that phase fluctuations
 in the superfluid order parameter play a dominant role on the phase diagram and superfluid properties.