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Refrigeration and thermometry of liquid3He-4He mixtures at very low temperatures

✍ Scribed by R. Ko¨nig; F. Pobell

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
142 KB
Volume
194-196
Category
Article
ISSN
0921-4526

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✦ Synopsis

In order to avoid possible sources of heat leaks into liquid 3He-4He mixtures we have constructed an experimental setup using only materlals of high purity. The inner part of an Ag-cell was furnished with a 700~-Ag sinter (A = llOm 2) and two vlbratlng wires. The temperature of the cell wall was measured by a Pt-NMR thermometer. The temperature of the mixture was determined by the damping of the vibrating wires immersed in the pure 3He-phase of a phase-separated mixture.

The achieved minimum temperature of a 6.SZmixture at p = 0.35bar is T = (130 ~ 25)~K.

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✍ G.J. Ehnholm; T.E. Katila; O.V. Lounasmaa; P. Reivari 📂 Article 📅 1968 🏛 Elsevier Science 🌐 English ⚖ 756 KB

A L L M/3ssbauer experiments at low temperatures published so far have been performed in cryostats in which liquid He 4 is the ultimate cooling agent. An early exception was the investigation of nuclear polarization of Co 5v in iron by Taylor l and his colleagues down to 0.35°K in a He 3 refrigerato