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- Title
Possible Dimensional Crossover to 1D of $$^3$$ He Fluid in Nanochannels Observed in Susceptibilities.
- Authors
Matsushita, Taku; Kurebayashi, Katsuya; Shibatsuji, Ryosuke; Hieda, Mitsunori; Wada, Nobuo
- Abstract
Dimensional crossover to the one-dimensional (1D) state from higher dimensions has been studied for dilute $$^3$$ He fluid adsorbed in 2.4 nm $$^4$$ He-preplated nanochannels, by susceptibility measurements down to 70 mK using 4.29 MHz nuclear magnetic resonance. In nanochannels, since energy states of $$^3$$ He motion perpendicular to the channel axis are discrete, a genuine 1D $$^3$$ He fluid is expected when the Fermi energy is less than the first excitation $$\Delta _{01}$$ for azimuthal motion. The susceptibilities $$\chi $$ above 0.3 K show the Curie-law susceptibilities independent of the $$^3$$ He density, which are characteristic of nondegenerate fluid in higher dimensions. With decreasing the temperature, a significant reduction of $$\chi T$$ was observed from about 0.3 K for all $$^3$$ He densities. It is considered to be due to the dimensional crossover below $$\Delta _{01}\sim 0.5$$ K to the 1D $$^3$$ He state in the semi-degenerate regime above the Fermi temperature. In the 1D state at lower temperatures, T-independent $$\chi $$ were observed for $$^3$$ He of 0.019 layers below 0.1 K. It suggests that the 1D $$^3$$ He fluid enters the quantum degenerate regime.
- Subjects
HELIUM at low temperatures; NANOELECTROMECHANICAL systems; QUANTUM fluids; CURIE law; ENERGY levels (Quantum mechanics); FERMI energy
- Publication
Journal of Low Temperature Physics, 2016, Vol 183, Issue 3/4, p251
- ISSN
0022-2291
- Publication type
Article
- DOI
10.1007/s10909-015-1369-8