Abstract
We have studied the field dependence of the heat capacity of a typical Haldane antiferromagnet (CH3)4NNi(NO)3 (TMNIN) doped with the nonmagnetic impurity Zn2+, as well as of a pure TMNIN. The overall features of the magnetic heat capacity, including the characteristic broad maximum, are almost reproduced by the theoretical curve with J/kB = -12K for both systems in zero field. The field dependence in the impure systems is described well by assuming the Schottky heat capacity with S = 1, not S = 1/2 expected from the VBS model. A possible reason why the S = 1 model is suitable is discussed.
Original language | English |
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Pages (from-to) | 740-743 |
Number of pages | 4 |
Journal | Journal of the Physical Society of Japan |
Volume | 68 |
Issue number | 3 |
DOIs | |
Publication status | Published - 1999 |
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)