Evidence for Z2-Vortex Excitations in the Quasi-Two-Dimensional Triangular Lattice Antiferromagnets HCrO2 and LiCrO2

  • Y. Ajiro
  • H. Kikuchi
Conference paper
Part of the Springer Series in Synergetics book series (SSSYN, volume 43)


The title compounds are the family of the AMO2-type (R\(\bar{3}\)m) crystal which has a pronounced layer structure and are promising candidates for the two-dimensional Heisenberg triangular lattice antiferromagnet (2DH TAL-AF). One of the characteristic features of this frustrated system with continuous spin symmetry is that it undergoes a new type of phase transition at TKM=0.66JS2 driven by the pairing of the topological point defects known as Z2 vorticies [1]. In the real substances accessible to the experimental study, three-dimensionally stacked TAL-AF exhibits a phase transition which belongs to a new universality class characterized by novel critical exponents as has been demonstrated recently [2,3]. It is still challenging, however, to give experimental evidence for the existence of such a unique vortex in ideal 2DH TAL-AF from the experiments on the real substances. Here we show [4], for the first time, that the electron paramagnetic resonance (EPR) experiments can be used to extract valuable information about Z2 vortex under some reasonable assumptions and provide experimental evidence for the existence of Z2 vortex excitations in the highly 2D ordered temperature region of the quasi-2D substances.


Electron Paramagnetic Resonance Triangular Lattice Universality Class Electron Paramagnetic Resonance Measurement Continuous Spin 
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Copyright information

© Springer-Verlag Berlin, Heidelberg 1989

Authors and Affiliations

  • Y. Ajiro
    • 1
  • H. Kikuchi
    • 1
  1. 1.Faculty of ScienceKyoto UniversityKyotoJapan

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