𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Nuclear demagnetization of thallium

✍ Scribed by U. Angerer; G. Eska

Publisher
Elsevier Science
Year
1984
Tongue
English
Weight
658 KB
Volume
24
Category
Article
ISSN
0011-2275

No coin nor oath required. For personal study only.

✦ Synopsis

A metallic TI sample of 99.998% nominal purity was precooled to 15 mK in a field of 6 T, During demagnetization unexpected and so far unexplained losses in the entropy reduction are observed; demagnetizing to O. 1 T yields a final temperature around 0.5 mK only, and demagnetization to below 75 mT results in a sudden loss of the total entropy reduction. The possible influence of type II superconductivity as well as eddy current heating effects are discussed. The nuclear stage consisting of 2. 7 mol of TI was protected against oxidation with a varnish coating and mounted on a

Cu support. Thermometry was done by means of pulsed NMR on T/2Β°5 of the bulk TI itseff and simultaneously on In 115 in an Auln 2 sample pressed onto the Cu support. The advantage of the small Korringa constant of 7"1 with respect to nuclear refrigeration is discussed.

πŸ“œ SIMILAR VOLUMES

KoΕ‘ice nuclear demagnetization refrigera
KoΕ‘ice nuclear demagnetization refrigerator
✍ P. Skyba; J. NyΓ©ki; E. GaΕΎo; V. MakroczyovΓ‘; Yu.M. Bunkov; D.A. Sergackov; A. Fe πŸ“‚ Article πŸ“… 1997 πŸ› Elsevier Science 🌐 English βš– 630 KB

## A nuclear demagnetization refrigerator with diffusion-welded copper nuclear stage has been constructed and successfully operated. The stage consists of 80 mol of copper and is capable, starting from an initial magnetic field of 6.4 T, of cooling the superfluid 3He-B down to temperatures of -280

Two-stage nuclear demagnetization refrig
Two-stage nuclear demagnetization refrigerator
✍ K. Γ΄no; S. Kobayasi; M. Shinohara; K. Asahi; H. Ishimoto; N. Nishida; M. Imaizum πŸ“‚ Article πŸ“… 1980 πŸ› Springer US 🌐 English βš– 315 KB

Two-stage nuclear demagnetization has been performed using PrCu6 and Cu as coolants. The Cu nuclear stage reached temperatures as low as 10 izK with a rate of temperature rise of less than a few IxK/h. The corresponding conduction electron temperature is estimated to be less than 50 I~K. A nuclear o

Compact PrNi5 nuclear demagnetization cr
Compact PrNi5 nuclear demagnetization cryostat
✍ S.A.J. Wiegers; T. Hata; C.C. Kranenburg; P.G. van de Haar; R. Jochemsen; G. Fro πŸ“‚ Article πŸ“… 1990 πŸ› Elsevier Science 🌐 English βš– 487 KB

We describe a compact combination of a powerful dilution refrigerator and a PrNis nuclear demagnetization stage. Both the nuclear stage and the demagnetization magnet are located in the empty space left by the heat exchangers of the dilution refrigerator and do not occupy extra space. We describe th