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 language | English |
|---|---|
| Title of host publication | AIP Conference Proceedings |
| Pages | 349-350 |
| Number of pages | 2 |
| Volume | 850 |
| DOIs | |
| Publication status | Published - 2006 |
| Event | LOW TEMPERATURE PHYSICS: 24th International Conference on Low Temperature Physics - LT24 - Orlando, FL, United States Duration: 2006 Aug 10 → 2006 Oct 17 |
Other
| Other | LOW TEMPERATURE PHYSICS: 24th International Conference on Low Temperature Physics - LT24 |
|---|---|
| Country | United States |
| City | Orlando, FL |
| Period | 06/8/10 → 06/10/17 |
Fingerprint
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 proceeding › Conference contribution
}
TY - GEN
T1 - Suppression of freezing and emergence of a novel ordered state in 4He confined in a nano - Porous material
AU - Yamamoto, K.
AU - Shibayama, Y.
AU - Shirahama, Keiya
PY - 2006
Y1 - 2006
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.
KW - Nano porous media
KW - Quantum phase transition
KW - Strongly correlated system
KW - Superfluidity
UR - http://www.scopus.com/inward/record.url?scp=33947496546&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=33947496546&partnerID=8YFLogxK
U2 - 10.1063/1.2354731
DO - 10.1063/1.2354731
M3 - Conference contribution
SN - 0735403473
SN - 9780735403475
VL - 850
SP - 349
EP - 350
BT - AIP Conference Proceedings
ER -