Nuclear Cooling in PrPt5 and PrTl3 to below 5 mdeg K
Abstract
Nuclear adiabatic demagnetization experiments have been carried out on the Van Vleck paramagnets PrPt5 and PrTl3. Starting from 60 mdeg K and 20 kOe, end temperatures of 5 and 3 mdeg K, respectively, are obtained. In PrPt5, the end temperature seems to be limited by a residual nuclear level splitting due to the hexagonal structure. No sign of a nuclear ordering phenomenon can be detected in PrTl3 down to 3 mdeg K. The suitability of these materials for magnetic cooling purposes is pointed out.
- Publication:
-
Physical Review Letters
- Pub Date:
- May 1970
- DOI:
- 10.1103/PhysRevLett.24.1181
- Bibcode:
- 1970PhRvL..24.1181A