Density dependence of the heat capacity anomaly in liquid 4He near lambda transition
β Scribed by T.-H. McCoy; E.H. Graf
- Publisher
- Elsevier Science
- Year
- 1972
- Tongue
- English
- Weight
- 139 KB
- Volume
- 38
- Category
- Article
- ISSN
- 0375-9601
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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
The lambda-type transition in the variation of heat capacity with temperature consists of a narrow asymmetric maximum in phonon-driven heat capacity. Although it was not so labeled at the time, "the specific heat singularity in solid NH 4 Cl", obtained by Simon in 1922 was the first true Ξ»-anomaly t