Suppression of freezing and emergence of a novel ordered state in 4He confined in a nano - Porous material

K. Yamamoto, Y. Shibayama, Keiya Shirahama

研究成果: Conference contribution

5 引用 (Scopus)

抄録

Confinement of 4He in a porous material with nanometer - size pores suppresses both the freezing and superfluidity. In our previous investigation of superfluid density of 4He confined in a porous Gelsil glass which has pores of 2.5 nm in diameter, it was demonstrated that the superfluidity is greatly suppressed by pressurization. In order to explore the overall P - T phase diagram, we study the liquid - solid coexistence line. The freezing pressure is elevated up to about 3.4 MPa and independent of temperature below 1.3 K. Along with the previous measurement of superfluid density these features indicate that a nonsuperfluid phase exists next to the solid phase. The flat freezing curve indicates that this nonsuperfluid phase has small entropy as well as that of solid. Therefore the nonsuperfluid phase is possibly a novel ordered state, in which the global phase coherence is destroyed by strong correlation between 4He atoms and/or by random potential.

元の言語English
ホスト出版物のタイトルAIP Conference Proceedings
ページ349-350
ページ数2
850
DOI
出版物ステータスPublished - 2006
イベントLOW TEMPERATURE PHYSICS: 24th International Conference on Low Temperature Physics - LT24 - Orlando, FL, United States
継続期間: 2006 8 102006 10 17

Other

OtherLOW TEMPERATURE PHYSICS: 24th International Conference on Low Temperature Physics - LT24
United States
Orlando, FL
期間06/8/1006/10/17

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porous materials
freezing
superfluidity
retarding
porosity
phase coherence
solid phases
phase diagrams
entropy
glass
curves
liquids
atoms
temperature

ASJC Scopus subject areas

  • Physics and Astronomy(all)

これを引用

Suppression of freezing and emergence of a novel ordered state in 4He confined in a nano - Porous material. / Yamamoto, K.; Shibayama, Y.; Shirahama, Keiya.

AIP Conference Proceedings. 巻 850 2006. p. 349-350.

研究成果: Conference contribution

Yamamoto, K, Shibayama, Y & Shirahama, K 2006, Suppression of freezing and emergence of a novel ordered state in 4He confined in a nano - Porous material. : AIP Conference Proceedings. 巻. 850, pp. 349-350, LOW TEMPERATURE PHYSICS: 24th International Conference on Low Temperature Physics - LT24, Orlando, FL, United States, 06/8/10. https://doi.org/10.1063/1.2354731
Yamamoto, K. ; Shibayama, Y. ; Shirahama, Keiya. / Suppression of freezing and emergence of a novel ordered state in 4He confined in a nano - Porous material. AIP Conference Proceedings. 巻 850 2006. pp. 349-350
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N2 - Confinement of 4He in a porous material with nanometer - size pores suppresses both the freezing and superfluidity. In our previous investigation of superfluid density of 4He confined in a porous Gelsil glass which has pores of 2.5 nm in diameter, it was demonstrated that the superfluidity is greatly suppressed by pressurization. In order to explore the overall P - T phase diagram, we study the liquid - solid coexistence line. The freezing pressure is elevated up to about 3.4 MPa and independent of temperature below 1.3 K. Along with the previous measurement of superfluid density these features indicate that a nonsuperfluid phase exists next to the solid phase. The flat freezing curve indicates that this nonsuperfluid phase has small entropy as well as that of solid. Therefore the nonsuperfluid phase is possibly a novel ordered state, in which the global phase coherence is destroyed by strong correlation between 4He atoms and/or by random potential.

AB - Confinement of 4He in a porous material with nanometer - size pores suppresses both the freezing and superfluidity. In our previous investigation of superfluid density of 4He confined in a porous Gelsil glass which has pores of 2.5 nm in diameter, it was demonstrated that the superfluidity is greatly suppressed by pressurization. In order to explore the overall P - T phase diagram, we study the liquid - solid coexistence line. The freezing pressure is elevated up to about 3.4 MPa and independent of temperature below 1.3 K. Along with the previous measurement of superfluid density these features indicate that a nonsuperfluid phase exists next to the solid phase. The flat freezing curve indicates that this nonsuperfluid phase has small entropy as well as that of solid. Therefore the nonsuperfluid phase is possibly a novel ordered state, in which the global phase coherence is destroyed by strong correlation between 4He atoms and/or by random potential.

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