Critical Phenomena of a Quantum Heisenberg-like Antiferromagnet

  • M. Matsuura
  • H. Kageyama
  • K. Koyama
Conference paper
Part of the Springer Series in Synergetics book series (SSSYN, volume 43)


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.


Entropy Anisotropy 


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Copyright information

© Springer-Verlag Berlin, Heidelberg 1989

Authors and Affiliations

  • M. Matsuura
    • 1
  • H. Kageyama
    • 1
  • K. Koyama
    • 2
  1. 1.Faculty of Engineering ScienceOsaka UniversityToyonakaJapan
  2. 2.Department of Electrical Engineering and ElectronicsToyohashi University of TechnologyToyohashiJapan

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