Ferroelectricity in a diatomic Ising chain as investigated by the elastic Ising model |
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| Authors: | Guo Yun-Jun Wang Ke-Feng Liu Jun-Ming |
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| Affiliation: | Laboratory of Solid State Microstructure, Nanjing University, Nanjing 210093, China; International Center for Materials Physics, Chinese Academy of Sciences, Shenyang 110016, China |
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| Abstract: | 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. |
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| Keywords: | multiferrocity elastic Ising model diatomic Ising spin chain |
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