2001 Fiscal Year Final Research Report Summary
Study for quantum condensed phases of one-and 2-dimensional helium 3 fluids
| Project/Area Number |
10203204
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| Research Category |
Grant-in-Aid for Scientific Research on Priority Areas (B)
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| Allocation Type | Single-year Grants |
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| Research Institution | The University of Tokyo |
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Principal Investigator |
WADA Nobuo Graduate school of Arts and Sciences, University of Tokyo Associate Professor, 大学院・総合文化研究科, 助教授 (90142687)
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| Co-Investigator(Kenkyū-buntansha) |
NAMAIZAWA Hiroshi Graduate school of Arts and Sciences, University of Tokyo Professor, 大学院・総合文化研究科, 教授 (10012486)
IKEGAMI Hiroki Graduate school of Arts and Sciences, University of Tokyo Assistant Professor, 大学院・総合文化研究科, 助手 (70313161)
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| Project Period (FY) |
1998 – 2000
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| Keywords | Helium / Strongly correlated Fermi liquids / quantum transition / superfluid transition / mesopore material / low-dimensional quantum fluid / pressure of adsorption / ultrasound measurement |
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| Research Abstract |
Helium 4 adsorbed on one-dimensional pores of the diameter about 18A has been studied by measuring pressure of adsorption at temperatures down to 0. 5K and the pressures within the accuracy of 0. 1Pa. From the pressure data, we obtained the coverage dependences of the adsorption energy and compressibility. The results indicate the layer-by-layer formation on the pore walls up to the second layer. The 2^<nd> layer was found to be the Bose fluids by the isotope effect of the 3He- and 4He-heat capacities and the superfluid observation by torsional oscillator. The 4He heat capacity of the 2^<nd> layer has a temperature -linear term, which was understood to be the 1D phonon heat capacity of the 2^<nd> Bose fluid layer. Then we realized the 1D Bose fluid in the 18A pores.
We can expect the 1D 3He Fermi fluids in the pores. From the heat capacity down to 80mK, we found that the 2^<nd> layer films are Fermi fluids. To see the 1D properties of the 3He fluids, we are preparing hear capacity measurement down to about 1mK by using the nuclear demagnetizing cryostat.
For 3He on Hectorite, the heat capacity results suggest the weak-localization-2D Fermi liquid and Mott-Hubbard transitions with increasing the coverage In the 2D Fermi liquids, we observed large density and spin-fluctuations characteristic to the two-dimension. For Helium 3 and 4 adsorbed on Hectorite, we obserbed atomic slippage in the ultra sound measurement at 10MHz.
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