Third sound measurements of superfluid4He films on multiwall carbon nanotubes below 1 K
| Autor: | Gary A. Williams, Bob Chen, Emin Menachekanian, Vito Iaia, Andrew Li, John Abraham |
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| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
History
Materials science chemistry.chemical_element FOS: Physical sciences Carbon nanotube 01 natural sciences 010305 fluids & plasmas Education law.invention Superfluidity Resonator law 0103 physical sciences 010306 general physics Condensed Matter - Materials Science Condensed matter physics Oscillation Transition temperature Materials Science (cond-mat.mtrl-sci) Dissipation Computer Science Applications Condensed Matter - Other Condensed Matter chemistry Q factor Carbon Other Condensed Matter (cond-mat.other) |
| Zdroj: | Menachekanian, E; Abraham, JBS; Chen, B; Iaia, V; Li, A; & Williams, GA. (2014). Third sound measurements of superfluid4He films on multiwall carbon nanotubes below 1 K. Journal of Physics: Conference Series, 568. doi: 10.1088/1742-6596/568/1/012026. UCLA: Retrieved from: http://www.escholarship.org/uc/item/7bw3g24x |
| DOI: | 10.1088/1742-6596/568/1/012026. |
| Popis: | Third sound is studied for superfluid films of 4He adsorbed on multiwall carbon nanotubes packed into an annular resonator. The third sound is generated with mechanical oscillation of the cell, and detected with carbon bolometers. A filling curve at temperatures near 250 mK shows oscillations in the third sound velocity, with maxima at the completion of the 4th and 5th atomic layers. Sharp changes in the Q factor of the third sound are found at partial layer fillings. Temperature sweeps at a number of fill points show strong broadening effects on the Kosterlitz-Thouless (KT) transition, and rapidly increasing dissipation, in qualitative agreement with the predictions of Machta and Guyer. At the 4th layer completion there is a sudden reduction of the transition temperature $T_{KT}$, and then a recovery back to linear variation with temperature, although the slope is considerably smaller than the KT prediction. Some of these effects may be related to changes in the gas-liquid coexistence regions. 5 pages, 5 figures, Proceedings of LT27 |
| Databáze: | OpenAIRE |
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