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Local structure and superconductivity in (Bi1.6Pb0.4Sr2Ca2Cu3O10+δ)1-x(Fe3O4)x compounds

Tran Faculty of Physics, VNU University of Science, Hanoi, Viet Nam|
Duc H. (56226812800) | Wantana (24759008000); Tran | I-Jui (8080189500); Klysubun | Won-Nam (7202401576); Hsu | Nguyen K. (36877713900); Kang | Nguyen H. (57208561720); Man Synchrotron Light Research Institute, Nakhon Ratchasima, Thailand| Nhung T. (57221473449); Nam Department of Chemistry, National Taiwan University, Taipei, Taiwan| Ha H. (57222316031); Nguyen Department of Physics, Sungkyunkwan University, Suwon, South Korea| An T. (57207858431); Pham International Training Institute for Materials Science, Hanoi University of Science and Technology, Hanoi, Viet Nam| Dzung T. (57221419491); Pham Nano and Energy Center, VNU University of Science, Hanoi, Viet Nam|

Ceramics International Số 12, năm 2021 (Tập 47, trang 16950-16955)

ISSN: 2728842

ISSN: 2728842

DOI: 10.1016/j.ceramint.2021.02.267

Tài liệu thuộc danh mục:

Article

English

Từ khóa: Bismuth compounds; Calcium compounds; Copper oxides; Hole concentration; Solid state reactions; Temperature; Temperature measurement; X ray absorption; 74.25.; 74.62.; 74.72.; BPSCCO; Critical temperatures; Dh; Hs; Valence state; X-ray absorption near-edge structure; −q; Magnetite
Tóm tắt tiếng anh
In this work, a close correlation between variations of critical temperature (Tc) and the hole concentration of (Bi1.6Pb0.4Sr2Ca2Cu3O10+δ)1-x(Fe3O4)x systems was studied. The (Bi1.6Pb0.4Sr2Ca2Cu3O10+δ)1-x(Fe3O4)x samples were fabricated using the solid-state reaction method, where x ranged from 0 to 0.2. The Tc values of the samples deduced from magnetization versus temperature measurement gradually decreased with increasing the Fe3O4 content (x). To investigate a possible reason for the observed decrease in the values of Tc in the samples, the valence state of copper (V) and the hole concentration (p) in all samples were examined by analyzing the Cu K-edge and Cu L2,3-edge X-ray absorption near edge structure (XANES) spectra. The values of V and p monotonously decreased with the increase in Fe3O4 doping content (x) and agreed with the behavior of Tc. The existence of Fe3+ was confirmed by analyzing Fe L2,3-edge XANES. Hence, Fe3+ ions possibly entered the lattice structure of the samples and filled the holes in CuO2 planes. The degradation of superconductivity in Fe3O4 doped samples was then explained. © 2021 Elsevier Ltd and Techna Group S.r.l.

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