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Low temperature ferromagnetism in CaCu3Ti4O12 |
| Song Yang(杨松)1, Xiao-Jing Luo(罗晓婧)1,†, Zhi-Ming Shen(申志明)1, Tian Gao(高湉)1, Yong-Sheng Liu(刘永生)1, and Shao-Long Tang(唐少龙)2,‡ |
1 Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power, Shanghai 200090, China;
2 Nanjing National Laboratory of Microstructures, Jiangsu Provincial Laboratory for Nanotechnology and Department of Physics, Nanjing University, Nanjing 210093, China |
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Abstract The low-temperature magnetic order behaviors of perovskite oxide CaCu3Ti4O12 (CCTO) ceramics prepared by different methods are discussed. X-ray diffraction, scanning electron microscope, x-ray photoelectron spectroscopy, and direct current (DC) magnetization are used to characterize the structures, microscopic morphologies, valence states, and magnetic properties of the samples. The results show that the magnetic behaviors of CCTO ceramics are very sensitive to the preparation process. The quenched CCTO ceramic and CCTO powders grown in a molten salt crystal, which contain much more oxygen vacancies and Ti3+, show the coexistence of weak ferromagnetic order and antiferromagnetic order below the Neel temperature. It suggests that the bound magnetopolaron formed by oxygen vacancies and Ti3+ ion composite defects are responsible for the weak ferromagnetic order at low temperature.
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Received: 31 December 2020
Revised: 14 February 2021
Accepted manuscript online: 16 March 2021
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PACS:
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81.40.Rs
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(Electrical and magnetic properties related to treatment conditions)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11504227 and 51971128), the Program of Shanghai Academic/Technology Research Leader, China (Grant No. 20XD1401800), and the Project of the Science and Technology Commission of Shanghai Municipality, China (Grant No. 19020501000). |
Corresponding Authors:
Xiao-Jing Luo, Shao-Long Tang
E-mail: xiaojing_luo@163.com;tangsl@nju.edu.cn
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Cite this article:
Song Yang(杨松), Xiao-Jing Luo(罗晓婧), Zhi-Ming Shen(申志明), Tian Gao(高湉), Yong-Sheng Liu(刘永生), and Shao-Long Tang(唐少龙) Low temperature ferromagnetism in CaCu3Ti4O12 2021 Chin. Phys. B 30 098103
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