Local Structure and Superconducting Properties of Bi 2 Te 3 -Doped YBa
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- 作者：Xueguang Dong (1)
Wenjuan Zhao (1)
Yankun Tang (1)
Peiquan Duan (2)
Hongguang Zhang (3)
Yongtao Li (3)
Hao Liu (1)
Xiaopeng Ge (1)
Qi Li (1) - 关键词：Topological insulator ; YBa2Cu3 O 7?ο Local structure disorder ; Holes
- 刊名：Journal of Superconductivity Incorporating Novel Magnetism
- 出版年：2014
- 出版时间：August 2014
- 年：2014
- 卷：27
- 期：8
- 页码：1819-1824
- 全文大小：1,082 KB
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Wenjuan Zhao (1)
Yankun Tang (1)
Peiquan Duan (2)
Hongguang Zhang (3)
Yongtao Li (3)
Hao Liu (1)
Xiaopeng Ge (1)
Qi Li (1)
1. Department of Physics, Southeast University, 211189, Nanjing, People’s Republic of China
2. Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied of Physics, Chinese Academy of Sciences, 201800, Shanghai, People’s Republic of China
3. College of Science, Nanjing University of Posts and Telecommunications, 210003, Nanjing, People’s Republic of China - ISSN：1557-1947
文摘
The samples of (Bi2Te3) x (YBa2Cu3 O 7?ο/sub>) 1?em class="a-plus-plus">x (x = 0, 2.5 %) have been synthesized at normal pressure, and the effect of the doping of topological insulator Bi2Te3 on the superconductor YBa2Cu3 O 7?ο/sub> is studied. The diamagnetism properties are investigated by zero-field cooling DC magnetization measurement. In the Bi2Te3-doped sample, an enhancement of superconducting fractions is observed, and the superconducting transition temperature (T c ) increases. For the sample with x= 2.5 %, the phase transition of the tetragonal phase to the orthorhombic phase is observed by X-ray diffraction, and the increase of the degree of local structure disorder is confirmed by extended X-ray absorption fine structure, so it can be concluded that the superconducting fraction enhancement is attributed to the phase transition induced by the addition of topological insulator Bi2Te3. Scanning electron microscopy images show that the added Bi2Te3 is found to adhere to the surface of YBa2Cu3 O 7?ο/sub> grains, and it is considered that the strain induced by grains-interaction leads to the phase transition which enhances the degree of local structure disorder at the same time. An absorption edge shift to the high-energy side is observed by the X-ray absorption near-edge structure. The edge shift can be attributed to the electron transfers from YBa2Cu3 O 7?ο/sub> to the additives. It is widely accepted that the hole intensity is closely related with T c , so in YBa2Cu3 O 7?ο/sub> the added holes by the transition may lead to the enhancement of T c . Thus, it can be concluded that the topological insulators can produce structural and electronic effect on the YBCO superconductors in the composite materials.