中国物理B ›› 2009, Vol. 18 ›› Issue (6): 2557-2564.doi: 10.1088/1674-1056/18/6/073

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Ferroelectricity in diatomic Ising chain as investigated by elastic Ising model

郭云均, 王克锋, 刘俊明   

  1. Laboratory of Solid State Microstructure, Nanjing University, Nanjing 210093, China International Center for Materials Physics, Chinese Academy of Sciences, Shenyang 110016, China
  • 收稿日期:2009-01-05 修回日期:2009-01-12 出版日期:2009-06-20 发布日期:2009-06-20
  • 基金资助:

    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).

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)†   

  1. Laboratory of Solid State Microstructure, Nanjing University, Nanjing 210093, China; International Center for Materials Physics, Chinese Academy of Sciences, Shenyang 110016, China
  • Received:2009-01-05 Revised:2009-01-12 Online:2009-06-20 Published:2009-06-20
  • Supported by:

    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).

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摘要：

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.

关键词: multiferrocity, elastic Ising model, diatomic Ising spin chain

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.

Key words: multiferrocity, elastic Ising model, diatomic Ising spin chain

中图分类号:  (Magnetomechanical effects, magnetostriction)

  • 75.80.+q
75.10.Hk (Classical spin models) 75.30.Cr (Saturation moments and magnetic susceptibilities) 77.22.Ej (Polarization and depolarization) 77.80.-e (Ferroelectricity and antiferroelectricity) 77.84.Bw (Elements, oxides, nitrides, borides, carbides, chalcogenides, etc.)