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Nuclear cooperative phenomena in copper at nanokelvin temperatures

Conference · · AIP Conf. Proc.; (United States)
OSTI ID:6096844
The authors present a study of nuclear cooperative phenomena in metallic copper by demagnetizing highly polarized spins to low fields where spin-spin interaction dominate. In zero external field, the critical temperature T/sub c/ of the antiferromagnetic phase was 60 +/- 10 nK, and during the first order transition the entropy changes from 0.49Rln4 to 0.65Rln4. The critical field B/sub c/ = 0.25 +/- 0.1 mT. Evidence for another transition at 0.09 mT was also seen. The entropy of nuclear spins in zero external field is presented as a function of temperature; the S vs. T diagram, however, is provisional especially in the ordered phase. 4 references, 6 figures.
Research Organization:
Helsinki Univ. of Technology, Espoo, Finland
OSTI ID:
6096844
Report Number(s):
CONF-830456-
Conference Information:
Journal Name: AIP Conf. Proc.; (United States) Journal Volume: 103
Country of Publication:
United States
Language:
English