Thermodynamic properties of tetrameric bond-alternating spin chains

Details Thermodynamic properties of tetrameric bond-alternating spin chains Thermodynamic properties of tetrameric bond-alternating spin chains

2004-12-10

arxiv.org/abs/cond-mat/0412275v2

Phys. Rev. B 71, 144426 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages, 12 figures; Replaced with final version accepted in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.71.144426

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 $T\to 0$, 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).

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