Superfluidity of 4He confined in a porous glass and control of the pore size

Yoshiyuki Shibayama; Keiya Shirahama

doi:10.1007/s10909-007-9439-1

Superfluidity of ⁴He confined in a porous glass and control of the pore size

Yoshiyuki Shibayama, Keiya Shirahama

Department of Physics

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

3 Citations (Scopus)

Abstract

⁴He confined in nanoporous media is one of the most interesting nano-sized systems. The aim of the present work is control of the pore size of nanoporous media in order to clarify the superfluid size effects. For the pore size control, monolayer adsorption of Kr on the pore wall is performed. The change in the pore size distribution by the monolayer adsorption are characterized by N ₂ isotherms at 77 K. Superfluidity in the pores is observed with a torsional oscillator method. The pore diameter of the as-purchased Gelsil is estimated at 5.8 nm. The monolayer adsorption reduces the size by 1.1 nm, caused by the thickness of the Kr monolayer. The decrease in the pore size lowers the superfluid transition temperature by 40 mK.

Original language	English
Pages (from-to)	803-807
Number of pages	5
Journal	Journal of Low Temperature Physics
Volume	148
Issue number	5-6
DOIs	https://doi.org/10.1007/s10909-007-9439-1
Publication status	Published - 2007 Sep

ASJC Scopus subject areas

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

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title = "Superfluidity of 4He confined in a porous glass and control of the pore size",

abstract = "4He confined in nanoporous media is one of the most interesting nano-sized systems. The aim of the present work is control of the pore size of nanoporous media in order to clarify the superfluid size effects. For the pore size control, monolayer adsorption of Kr on the pore wall is performed. The change in the pore size distribution by the monolayer adsorption are characterized by N 2 isotherms at 77 K. Superfluidity in the pores is observed with a torsional oscillator method. The pore diameter of the as-purchased Gelsil is estimated at 5.8 nm. The monolayer adsorption reduces the size by 1.1 nm, caused by the thickness of the Kr monolayer. The decrease in the pore size lowers the superfluid transition temperature by 40 mK.",

author = "Yoshiyuki Shibayama and Keiya Shirahama",

note = "Funding Information: Acknowledgements 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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AU - Shibayama, Yoshiyuki

AU - Shirahama, Keiya

N1 - Funding Information: Acknowledgements 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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N2 - 4He confined in nanoporous media is one of the most interesting nano-sized systems. The aim of the present work is control of the pore size of nanoporous media in order to clarify the superfluid size effects. For the pore size control, monolayer adsorption of Kr on the pore wall is performed. The change in the pore size distribution by the monolayer adsorption are characterized by N 2 isotherms at 77 K. Superfluidity in the pores is observed with a torsional oscillator method. The pore diameter of the as-purchased Gelsil is estimated at 5.8 nm. The monolayer adsorption reduces the size by 1.1 nm, caused by the thickness of the Kr monolayer. The decrease in the pore size lowers the superfluid transition temperature by 40 mK.

AB - 4He confined in nanoporous media is one of the most interesting nano-sized systems. The aim of the present work is control of the pore size of nanoporous media in order to clarify the superfluid size effects. For the pore size control, monolayer adsorption of Kr on the pore wall is performed. The change in the pore size distribution by the monolayer adsorption are characterized by N 2 isotherms at 77 K. Superfluidity in the pores is observed with a torsional oscillator method. The pore diameter of the as-purchased Gelsil is estimated at 5.8 nm. The monolayer adsorption reduces the size by 1.1 nm, caused by the thickness of the Kr monolayer. The decrease in the pore size lowers the superfluid transition temperature by 40 mK.

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