Superfluidity of 4He adsorbed on nanoporous activated carbon fibers

Yoshiyuki Shibayama; Keiya Shirahama

doi:10.1007/s10909-007-9440-8

Superfluidity of ⁴He adsorbed on nanoporous activated carbon fibers

Yoshiyuki Shibayama, Keiya Shirahama

Department of Physics

Research output: Contribution to journal › Article › peer-review

Abstract

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 T _c ∼ 550 mK. With an increase in n the superfluid density enhances, but T _c 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.

Original language	English
Pages (from-to)	809-813
Number of pages	5
Journal	Journal of Low Temperature Physics
Volume	148
Issue number	5-6
DOIs	https://doi.org/10.1007/s10909-007-9440-8
Publication status	Published - 2007 Sept

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics
Materials Science(all)
Condensed Matter Physics

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10.1007/s10909-007-9440-8

Cite this

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title = "Superfluidity of 4He adsorbed on nanoporous activated carbon fibers",

abstract = "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 T c ∼ 550 mK. With an increase in n the superfluid density enhances, but T c 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.",

author = "Yoshiyuki Shibayama and Keiya Shirahama",

note = "Funding Information: Acknowledgements The authors express their gratitude to Professor M. Suzuki for valuable discussion. This work is partially supported by Grant-in-Aid for Scientific Research on Priority Area (Grant No. 17071010) and for Scientific Research (A) (Grant No. 16204028) from MEXT.",

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doi = "10.1007/s10909-007-9440-8",

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AU - Shibayama, Yoshiyuki

AU - Shirahama, Keiya

N1 - Funding Information: Acknowledgements The authors express their gratitude to Professor M. Suzuki for valuable discussion. This work is partially supported by Grant-in-Aid for Scientific Research on Priority Area (Grant No. 17071010) and for Scientific Research (A) (Grant No. 16204028) from MEXT.

PY - 2007/9

Y1 - 2007/9

N2 - 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 T c ∼ 550 mK. With an increase in n the superfluid density enhances, but T c 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.

AB - 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 T c ∼ 550 mK. With an increase in n the superfluid density enhances, but T c 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.

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Superfluidity of ⁴He adsorbed on nanoporous activated carbon fibers

Abstract

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