Chin. Phys. Lett.  2009, Vol. 26 Issue (10): 107503    DOI: 10.1088/0256-307X/26/10/107503
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
120° Ordered Phase of Triangular Lattice Antiferromagnetic Heisenberg Model with Long Range Couplings
DONG Zhan-Hai
Department of Physics, Shanghai Jiao Tong University, Shanghai 200240
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DONG Zhan-Hai 2009 Chin. Phys. Lett. 26 107503
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Abstract In order to look for the 120° order phase of triangular lattice Heisenberg antiferromagnet with long range couplings, the Hamiltonian is diagonalized with the Bogoliubov transformation within linear spin-wave approximation. It is found that when the long range spin couplings are taken into account, the transformation is valid only for certain regions in the spin coupling parameter space. These regions just correspond to the 120° (or Néel) ordered phase, which is very different from square lattice in terms of shape, size and topological property.
Keywords: 75.30.Ds      75.50.Ee      74.25.Ha     
Received: 29 June 2009      Published: 27 September 2009
PACS:  75.30.Ds (Spin waves)  
  75.50.Ee (Antiferromagnetics)  
  74.25.Ha (Magnetic properties including vortex structures and related phenomena)  
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https://cpl.iphy.ac.cn/10.1088/0256-307X/26/10/107503       OR      https://cpl.iphy.ac.cn/Y2009/V26/I10/107503
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DONG Zhan-Hai
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[2] Dong Z H 2004 Solid State Commun. 130 301
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[7] McKenzie R H 1997 Science 278 820
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[9] Leung P W and Runge K J 1993 Phys. Rev. B 475861
[10] Moreo A et al 1990 Phys. Rev. B 42 6283
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