Fabrication of Tl2Ba2CaCu2O8 superconducting films without thallium pellets

doi:10.1088/1674-1056/27/5/057403

Abstract A new improved two-step method in fabricating Tl₂Ba₂CaCu₂O₈ (Tl-2212) thin films is presented in this paper. In the first process of dc magnetron sputtering, the thallium content in the precursor film is largely increased by adjusting the ratio of thallium in the sputtering targets. After the second annealing process in the absence of additional thallium pellets or powder source, high-quality Tl-2212 thin films can be obtained. The proper content of thallium in the precursor film provides a relatively stable atmosphere to guarantee the growth of Tl-2212 film. This method avoids the repeated production of the thallium pellets in the post-annealing process, the repeatability and controllability of the experiment are greatly improved. X-ray diffraction (XRD) scans show that all of the sharp peaks of the sample films can be assigned to the (00l) peaks of Tl-2212 phase. The highest superconducting critical temperature (T_c) of the films is 105 K and the critical current density (J_c) can achieve 1.93 MA/cm² in zero magnetic field at 77 K for a 600 nm film.

Keywords: Tl-2212 superconducting films post-annealing critical temperature critical current density

Received: 19 December 2017
Revised: 30 January 2018
Accepted manuscript online:

PACS:

74.78.-w

(Superconducting films and low-dimensional structures)

Fund: Project supported by the National Natural Science Foundation of China (Grant No.51002081),the Fundamental Research Funds for the Central Universities,China,and the Research Program of Application Foundation and Advanced Technology of Tianjin,China (Grant No.15JCQNJC01300).

Corresponding Authors: Lu Ji
E-mail: luji@nankai.edu.cn

Cite this article:

Teng-Da Xu(徐腾达), Jian Xing(邢建), Li-Tian Wang(王荔田), Jin-Li Zhang(张金利), Sheng-Hui Zhao(赵生辉), Yang Xiong(熊阳), Xin-Jie Zhao(赵新杰), Lu Ji(季鲁), Xu Zhang(张旭), Ming He(何明) Fabrication of Tl₂Ba₂CaCu₂O₈ superconducting films without thallium pellets 2018 Chin. Phys. B 27 057403

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Fabrication of Tl2Ba2CaCu2O8 superconducting films without thallium pellets

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Fabrication of Tl₂Ba₂CaCu₂O₈ superconducting films without thallium pellets