Superfluidity of 4He Adsorbed on Nanoporous Activated Carbon Fibers

• Published in: Journal of low temperature physics Vol. 148; no. 5-6; pp. 809 - 813
• Main Authors: Shibayama, Yoshiyuki, Shirahama, Keiya
• Format: Journal Article
• Language: English
• Published: New York Springer Nature B.V 01-09-2007
• Subjects: Activated carbon; Carbon fibers; Fluids; Low temperature physics; Superfluidity
• ISSN: 0022-2291; 1573-7357
• DOI: 10.1007/s10909-007-9440-8

4He confined in nanoporous media is one of the most interesting nano-sized systems in the context of an interacting Bose system. In the present work, we study superfluidity of 4He adsorbed in nanoporous activated carbon fibers (ACFs). Up to a 4He coverage of n=22.6 μmol m−2, no superfluidity is observed. Over 23.7 μmol m−2, superfluid transition is observed at Tc∼550 mK. With an increase in n the superfluid density enhances, but Tc is independent of n. These observations indicate that the thickness of the superfluid 4He films on the pore wall is restricted by a slit type pore shape of ACFs.