Low Temperature Heat Capacity of the Metamagnet Ni(NO3)2.2H2O.
CARNEGIE-MELLON UNIV PITTSBURGH PA DEPT OF PHYSICS
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The heat capacity C sub P of NiNO32.2H2O 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
- Electricity and Magnetism
- Solid State Physics