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Magnetic and dielectric properties of metamagnetic TbCo0.5Mn0.5O3.07 ceramics

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Abstract

The ceramic TbCo0.5Mn0.5O3.07 of double-perovskite structure was prepared by solid-state reaction. Its crystal structure and magnetic and dielectric properties were investigated by first-principles calculations and experimental observations. TbCo0.5Mn0.5O3.07 possesses a monoclinic structure with P21/n space group. The c axis is the easy-magnetization axis, and it is largely caused by Co2+ anisotropy. The predominant valence states are Mn4+ and Co2+, with a small amount of Co3+ coexisting with Co2+. The ordering of Mn4+ and Co2+ results in ferromagnetic Mn4+–Co2+ interactions. Partial disorder of the B-site creates antiferromagnetic Co2+–O–Co2+ or Mn4+–O–Mn4+ interactions. The origin of metamagnetism is associated with the coexistence of antiferromagnetic and ferromagnetic phases. The magnetic exchange bias is strongly dependent on magnetic field, which is considered to be related to the metamagnetic behavior. The possibility of spin glass behavior is excluded by AC susceptibility measurements. The two observed dielectric relaxations are caused by electrons hopping between Co2+ and Mn4+ and between Co3+ and Mn4+.

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Acknowledgements

Computer resources provided by the High Performance Computing Center of Nanjing University are gratefully acknowledged. This work was supported by the State Key Program for Basic Researches of China under Grant No. 2009CB929501, the National Science Foundation of China (Nos. 11374169, 61271078, 51225201 and 11174166), the Distinguished Middle-aged and Young Scientist Encourage and Reward Foundation of Shandong Province, China (No. BS2013CL006), the Taishan Scholars Program of Shandong Province, the Fundamental Research Funds for the Central Universities, the Priority Academic Program Development of Jiangsu Higher Education Institutions, and the Natural Science Research Project for Universities from the Education Department of Anhui Province (KJ2008B113ZC).

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Authors and Affiliations

  1. College of Physics Science, Key Laboratory of Photonics Materials and Technology in Universities of Shandong, Qingdao University, Qingdao, 266071, People’s Republic of China

    J. Su, C. J. Lu & Q. C. Li

  2. National Laboratory of Solid State Microstructures, Physics School, Nanjing University, Nanjing, 210093, People’s Republic of China

    J. T. Zhang, X. M. Lu, J. He, J. Zhou & J. S. Zhu

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  1. J. Su
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Correspondence to J. Su, X. M. Lu or J. S. Zhu.

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Su, J., Zhang, J.T., Lu, X.M. et al. Magnetic and dielectric properties of metamagnetic TbCo0.5Mn0.5O3.07 ceramics. J Mater Sci 49, 3681–3686 (2014). https://doi.org/10.1007/s10853-014-8076-8

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