Thermodynamic properties of a spin-12diamond chain as a model for a molecule-based ferrimagnet and the compoundCu3(CO3)2(OH)2
Thermodynamic properties of a spin-12diamond chain as a model for a molecule-based ferrimagnet and the compoundCu3(CO3)2(OH)2
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DOI：
10.1103/physrevb.73.104454
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发表时间：
2006-03
影响因子：
3.7
通讯作者：
H. Fu;K. Yao;Z. Liu
中科院分区：
文献类型：
--
作者：
H. Fu;K. Yao;Z. Liu
The thermodynamic properties of the spin- 12 diamond-chain model have been investigated by means of Green’s function theory combined with the Jordan-Wigner transformation. According to the different exchange interactions, two typical physical topics are discussed in the paper. (i) Antiferromagnetic (AF)-AF-ferromagneticferrimagnetic diamond spin chain as a model for the molecule-based ferrimagnet, which is composed ofbiradical andmonoradical alternating with antiferromagnetic interactions along the chain, and thesite is composed of twospins by a finite ferromagnetic interaction. The temperature dependence of the specific heat of this model shows remarkable double-peak structure due to the ferromagnetic gapless and antiferromagnetic gap excitation of the spin system, the magnetization curve has a clear plateau at one third of the saturation magnetization, and the susceptibilities exhibit typical ferrimagnetic feature, which is well consistent with experimental findings. (ii) AF-AF-AF frustrated diamond spin chain as a model for the recent thermodynamics measurements onby Kikuchi [Phys. Rev. Lett. 94, 227201 (2005)]. The theoretical calculations show that the temperature dependence of magnetic susceptibilities display as a double-peak structure and the specific heat shows a three-peak structure. In particular, the magnetization curve also has a clear plateau at one third of the saturation magnetization with three critical field values,, and, which are in quantitative agreement with the experimental observations.
