Low Temperature Heat Capacity of the Metamagnet Ni(NO3)2.2H2O.
Abstract
The heat capacity C sub P of Ni(NO3)2.2H2O has been measured in the range 1.5 = or < T = or < 10K, revealing a sharp lambda-anomaly, characteristic of the transition to a magnetically ordered state, at T sub N = 4.105 plus or minus 0.005K. The magnetic contribution to C sub P has been separated from the lattice part and the temperature variation of the magnetic entropy calculated. The magnetic entropy at T sub N is found to be only 0.546R suggesting a two-dimensional character to the ordering which is compatible with the picture of this system as an antiferromagnetically coupled array of alternating sheets of ferromagnetically aligned Ni++ spins. This interpretation, however, is complicated by the effect of anisotropy on C sub P. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 15, 1971
- Accession Number
- AD0725169
Entities
People
- L. G. Polgar
- S. A. Friedberg
Organizations
- Carnegie Mellon University