Abstract
Ordering of two-dimensional Heisenberg (2DH) spin systems has been a most interesting problem from the viewpoint of cooperativity. Any phase transition associated with long range order was predicted not to occur down to 0 K[1], So the phase transition with spontaneous magnetization found in the actual 2DH-like magnets examined so far has been attributed to a non-negligible interplane interaction and/or Ising(I)-type anisotropy. Apart from the ideal behaviour, the phase transition of 2DH-like antiferromagnets, especially of S=l/2 if any, is interesting because the critical phenomena could be modified by large quantum fluctuations[2] and a new aspect of cooperativity may be found.
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Matsuura, M., Kageyama, H., Koyama, K. (1989). Critical Phenomena of a Quantum Heisenberg-like Antiferromagnet. In: Takayama, H. (eds) Cooperative Dynamics in Complex Physical Systems. Springer Series in Synergetics, vol 43. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-74554-6_17
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DOI: https://doi.org/10.1007/978-3-642-74554-6_17
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