Ferroelectricity in a diatomic Ising chain as investigated by the elastic Ising model
Guo Yun-Jun(郭云均), Wang Ke-Feng(王克锋), and Liu Jun-Ming(刘俊明)†
Laboratory of Solid State Microstructure, Nanjing University, Nanjing 210093, China; International Center for Materials Physics, Chinese Academy of Sciences, Shenyang 110016, China
An elastic Ising model for a one-dimensional diatomic spin chain is proposed to explain the ferroelectricity induced by the collinear magnetic order with a low-excited energy state. A statistical theory based on this model is developed to calculate the electrical and magnetic properties of Ca3CoMnO6, a typical quasi-one-dimensional diatomic spin chain system. The calculated ferroelectric polarization and dielectric susceptibility show a good agreement with recently reported data on Ca3Co2-xMnxO6 (x ≈0.96) (Phys. Rev. Lett.100 047601 (2008)), although the predicted magnetic susceptibility does not coincide well with experiment. We also address the rationality and deficiency of this model by including a first-order correction which improves the consistency between the model and experiment.
Received: 05 January 2009
Revised: 12 January 2009
Accepted manuscript online:
Project supported by the National Natural Science Foundation of China (Grant Nos 50832002, 10674061 and 10874075), and the National Key Projects for Basic Research of China (Grant Nos 2006CB921802 and 2009CB623303).
Cite this article:
Guo Yun-Jun(郭云均), Wang Ke-Feng(王克锋), and Liu Jun-Ming(刘俊明) Ferroelectricity in a diatomic Ising chain as investigated by the elastic Ising model 2009 Chin. Phys. B 18 2557
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