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Analytic evidence of the equivalence of the alternating Heisenberg spin chain to the mixed spin (1, 1/2) Heisenberg chain |
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| Authors: | Jian-Jun Jiang Yong-Jun LiuFei Tang Cui-Hong Yang |
| Institution: | a Department of Physics, Sanjiang College, Nanjing 210012, China b School of Physics Science and Technology, Yangzhou University, Yangzhou 225002, China c Department of Electronic and Information Engineering, Yangzhou Polytechnic Institute, Yangzhou 225002, China d Faculty of Mathematics and Physics, Nanjing University of Information Science and Technology, Nanjing 210044, China |
| Abstract: | We investigated the properties of the spin-1/2 ferromagnetic-antiferromagnetic-antiferromagnetic alternating Heisenberg chain using the spin-wave theory. The spin-wave excitation spectra, the sublattice magnetizations and the local bond energies of the model are calculated to be compared with the corresponding properties of the mixed spin (1, 1/2) chain for a range of α. The results demonstrate that all the properties show similar behaviours in the small α limit, so the properties of the mixed spin (1, 1/2) chain can be described using the spin-1/2 ferromagnetic-antiferromagnetic-antiferromagnetic alternating Heisenberg chain. |
| Keywords: | Heisenberg chain Spin-wave excitation Sublattice magnetizations Local bond energies |
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