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Thermodynamic properties of tetrameric bond-alternating spin chains | | H.T. Lu
; Y.H. Su
; L.Q. Sun
; J. Chang
; C.S. Liu
; H.G. Luo
; T. Xiang
; | | Date: |
10 Dec 2004 | | Journal: | Phys. Rev. B 71, 144426 (2005) | | Subject: | Strongly Correlated Electrons; Materials Science | cond-mat.str-el cond-mat.mtrl-sci | | Abstract: | Thermodynamic properties of a tetrameric bond-alternating Heisenberg spin chain with ferromagnetic-ferromagnetic-antiferromagnetic-antiferromagnetic exchange interactions are studied using the transfer-matrix renormalization group and compared to experimental measurements. The temperature dependence of the uniform susceptibility exhibits typical ferrimagnetic features. Both the uniform and staggered magnetic susceptibilities diverge in the limit $T o 0$, indicating that the ground state has both ferromagnetic and antiferromagnetic long-range orders. A double-peak structure appears in the temperature dependence of the specific heat. Our numerical calculation gives a good account for the temperature and field dependence of the susceptibility, the magnetization, and the specific heat for Cu(3-Clpy)$_{2}$(N$_{3}$)$_{2}$ (3-Clpy=3-Chloroyridine). | | Source: | arXiv, cond-mat/0412275 | | Services: | Forum | Review | PDF | Favorites | |
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