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

K. Yamamoto, Y. Shibayama, Keiya Shirahama

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Citations (Scopus)

Abstract

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.

Original languageEnglish
Title of host publicationAIP Conference Proceedings
Pages349-350
Number of pages2
Volume850
DOIs
Publication statusPublished - 2006
EventLOW TEMPERATURE PHYSICS: 24th International Conference on Low Temperature Physics - LT24 - Orlando, FL, United States
Duration: 2006 Aug 102006 Oct 17

Other

OtherLOW TEMPERATURE PHYSICS: 24th International Conference on Low Temperature Physics - LT24
CountryUnited States
CityOrlando, FL
Period06/8/1006/10/17

Fingerprint

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

Keywords

  • Nano porous media
  • Quantum phase transition
  • Strongly correlated system
  • Superfluidity

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

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. Vol. 850 2006. p. 349-350.

Research output: Chapter in Book/Report/Conference proceedingConference 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. in AIP Conference Proceedings. vol. 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. Vol. 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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