Phase Transition of Superfluid 3He in Aerogel
We have studied phase transition of superfluid 3He in 97.5% porosity aerogel by NMR method. Above 1.0 MPa, superfluid phase transition has been observed. The transition temperature Tca is strongly suppressed from its bulk value. The Pressure-Temperature diagram suggests that superfluid phase will no...
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| Veröffentlicht in: | Journal of low temperature physics 2007-09, Vol.148 (5-6), p.585-589 |
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| creator | Kado, Ryusuke Nakagawa, Hisashi Obara, Ken Yano, Hideo Ishikawa, Osamu Hata, Tohru |
| description | We have studied phase transition of superfluid 3He in 97.5% porosity aerogel by NMR method. Above 1.0 MPa, superfluid phase transition has been observed. The transition temperature Tca is strongly suppressed from its bulk value. The Pressure-Temperature diagram suggests that superfluid phase will not appear below near 0.8 MPa. The A-B phase transition has been observed above 1.3 MPa, below which a state of superfluid phases remains to be identified. The temperature dependence of NMR frequency shifts Δf in the A-like and the B-like phases are almost linear at pressures below 2.4 MPa. We obtained the differential coefficient of NMR frequency shifts ∂(Δf)/∂(T/Tca) at 0.9Tca as a function of pressure, and it suggests that superfluid phase will not appear below near 0.8 MPa which is the same pressure estimated by P-T diagram. |
| doi_str_mv | 10.1007/s10909-007-9476-9 |
| format | Article |
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Above 1.0 MPa, superfluid phase transition has been observed. The transition temperature Tca is strongly suppressed from its bulk value. The Pressure-Temperature diagram suggests that superfluid phase will not appear below near 0.8 MPa. The A-B phase transition has been observed above 1.3 MPa, below which a state of superfluid phases remains to be identified. The temperature dependence of NMR frequency shifts Δf in the A-like and the B-like phases are almost linear at pressures below 2.4 MPa. We obtained the differential coefficient of NMR frequency shifts ∂(Δf)/∂(T/Tca) at 0.9Tca as a function of pressure, and it suggests that superfluid phase will not appear below near 0.8 MPa which is the same pressure estimated by P-T diagram.</description><identifier>ISSN: 0022-2291</identifier><identifier>EISSN: 1573-7357</identifier><identifier>DOI: 10.1007/s10909-007-9476-9</identifier><language>eng</language><publisher>New York: Springer Nature B.V</publisher><subject>Aerogels ; Fluids ; Low temperature physics ; NMR ; Nuclear magnetic resonance ; Phase transitions ; Superfluidity ; Temperature dependence ; Transition temperature</subject><ispartof>Journal of low temperature physics, 2007-09, Vol.148 (5-6), p.585-589</ispartof><rights>Springer Science+Business Media, LLC 2007.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c1845-383a949c9b5920f02cfbcb0ef64a86fad084dcadd34ec330ac1cfb0d170e8313</citedby><cites>FETCH-LOGICAL-c1845-383a949c9b5920f02cfbcb0ef64a86fad084dcadd34ec330ac1cfb0d170e8313</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,27924,27925</link.rule.ids></links><search><creatorcontrib>Kado, Ryusuke</creatorcontrib><creatorcontrib>Nakagawa, Hisashi</creatorcontrib><creatorcontrib>Obara, Ken</creatorcontrib><creatorcontrib>Yano, Hideo</creatorcontrib><creatorcontrib>Ishikawa, Osamu</creatorcontrib><creatorcontrib>Hata, Tohru</creatorcontrib><title>Phase Transition of Superfluid 3He in Aerogel</title><title>Journal of low temperature physics</title><description>We have studied phase transition of superfluid 3He in 97.5% porosity aerogel by NMR method. Above 1.0 MPa, superfluid phase transition has been observed. The transition temperature Tca is strongly suppressed from its bulk value. The Pressure-Temperature diagram suggests that superfluid phase will not appear below near 0.8 MPa. The A-B phase transition has been observed above 1.3 MPa, below which a state of superfluid phases remains to be identified. The temperature dependence of NMR frequency shifts Δf in the A-like and the B-like phases are almost linear at pressures below 2.4 MPa. 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Above 1.0 MPa, superfluid phase transition has been observed. The transition temperature Tca is strongly suppressed from its bulk value. The Pressure-Temperature diagram suggests that superfluid phase will not appear below near 0.8 MPa. The A-B phase transition has been observed above 1.3 MPa, below which a state of superfluid phases remains to be identified. The temperature dependence of NMR frequency shifts Δf in the A-like and the B-like phases are almost linear at pressures below 2.4 MPa. We obtained the differential coefficient of NMR frequency shifts ∂(Δf)/∂(T/Tca) at 0.9Tca as a function of pressure, and it suggests that superfluid phase will not appear below near 0.8 MPa which is the same pressure estimated by P-T diagram.</abstract><cop>New York</cop><pub>Springer Nature B.V</pub><doi>10.1007/s10909-007-9476-9</doi><tpages>5</tpages></addata></record> |
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| subjects | Aerogels Fluids Low temperature physics NMR Nuclear magnetic resonance Phase transitions Superfluidity Temperature dependence Transition temperature |
| title | Phase Transition of Superfluid 3He in Aerogel |
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