Phase Transitions in a Highly Anisotropic Antiferromagnetic Heisenberg Toda Chain |
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| Authors: | Zhu-pei SHI Rui-bao TA |
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| Institution: | 1. Department of Physics, Fudan University, Shanghai 200433, China;
2. Center of Theoretical Physics, CCAST (World Laboratory), Beijing 100080, China;
3. Department of Physics, hdan University, Shanghai 200433, China |
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| Abstract: | The behavior of the antiferromagnetic spin 112 Heisenberg Toda chain is investigated in a space of interactions which include exchange anisotropy, bond alternation and Toda-like spinlattice coupling by means of coherent-state for spin. We analyse magnetically driven lattice instabilities and find that multiphase structure only occurs under the condition, of bond alternation. Three phase diagrams and tricritical points are obtained and some relevant physical properties are discussed. |
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