Observation of a maximum roton velocity in superfluid 4He
β Scribed by S. Balibar; J. Buechner; B. Castaing; C. Laroche; A. Libchaber
- Publisher
- Elsevier Science
- Year
- 1977
- Tongue
- English
- Weight
- 197 KB
- Volume
- 60
- Category
- Article
- ISSN
- 0375-9601
No coin nor oath required. For personal study only.
π SIMILAR VOLUMES
We report new high precision data on the velocity of second sound close to the lambda transition of 4He at the saturated vapor pressure. The second sound wave is detected by a powdered salt pill of copper ammonium bromide in direct contact with the liquid helium. With a thermometer noise of < 10-1Β°K
LIgUID HELIUM S 143 heat transport by liquid 4He through a narrow slit at eleven temperatures between 1. IΒ°K and 2. IΒ°K for values of AT up to 1000 millidegrees. The slit (1.9 cm long and 2 microns wide) connects two reservoirs of liquid helium, one thermally isolated and fitted with a heater, the o