Low temperature ferromagnetism in CaCu3Ti4O12

doi:10.1088/1674-1056/abeef0

中国物理B ›› 2021, Vol. 30 ›› Issue (9): 98103-098103.doi: 10.1088/1674-1056/abeef0

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

收稿日期:2020-12-31 修回日期:2021-02-14 接受日期:2021-03-16 出版日期:2021-08-19 发布日期:2021-08-31
通讯作者: Xiao-Jing Luo, Shao-Long Tang E-mail:xiaojing_luo@163.com;tangsl@nju.edu.cn
基金资助:
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).

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

Received:2020-12-31 Revised:2021-02-14 Accepted:2021-03-16 Online:2021-08-19 Published:2021-08-31
Contact: Xiao-Jing Luo, Shao-Long Tang E-mail:xiaojing_luo@163.com;tangsl@nju.edu.cn
Supported by:
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).

摘要/Abstract

摘要： 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.

关键词: CaCu₃Ti₄O₁₂, oxygen vacancies, magnetic ordering

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.

Key words: CaCu₃Ti₄O₁₂, oxygen vacancies, magnetic ordering

中图分类号: (Electrical and magnetic properties related to treatment conditions)

81.40.Rs

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[J]. 中国物理B, 2021, 30(9): 98103-098103.

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[J]. Chin. Phys. B, 2021, 30(9): 98103-098103.

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Low temperature ferromagnetism in CaCu₃Ti₄O₁₂

Low temperature ferromagnetism in CaCu₃Ti₄O₁₂

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