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  Atomic origin of the coexistence of high critical current density and high Tc in CuBa2Ca3Cu4O10+δ superconductors

Zhang, X., Zhao, J., Zhao, H., Shi, L., Deng, S., Chen, J., et al. (2022). Atomic origin of the coexistence of high critical current density and high Tc in CuBa2Ca3Cu4O10+δ superconductors. NPG Asia Materials, 14(1): 50, pp. 1-8. doi:10.1038/s41427-022-00396-2.

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Zhang, Xuefeng1, Author
Zhao, Jianfa1, Author
Zhao, Huijuan1, Author
Shi, Luchuan1, Author
Deng, Sihao1, Author
Chen, Jie1, Author
He, Lunhua1, Author
Hu, Zhiwei2, Author              
Jin, Changqing1, Author
Zhu, Jing1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Zhiwei Hu, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863461              

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 Abstract: For cuprate superconductors, a high critical transition temperature (T-c) can be realized in compounds containing multiple CuO2 layers in the unit cell, while a high critical current density (J(c)) is rarely sustained above liquid nitrogen temperature. The CuBa2Ca3Cu4O10+delta (Cu-1234) superconductors synthesized under high oxygen pressure incredibly exhibit high T-c (similar to 117 K) and high J(c) (>10(4) A/cm(2), 100K) values. Here, the "double high" traits of Cu-1234 were investigated with advanced scanning transmission electron microscopy. It was revealed that ordering vacancies and plate-like 90 degrees microdomains induced efficient microstructure pinning centers that suppressed vortex flux flow and enhanced J(c). Furthermore, metallic charge-reservoir blocks [Ba2CuO3+delta] were composed of unique compressed [CuO6] octahedra, which induced many holes with 2p(z) symmetry that significantly decreased the superconducting anisotropy and dramatically enhanced the interlayer coupling that guaranteed a high J(c). On the other hand, optimally doped CuO2 planes inside the thick superconducting blocks [Ca3Cu4O8] maintained a high Our results are applicable to design and synthesis of new superconductors with "double high" traits.

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Language(s): eng - English
 Dates: 2022-06-102022-06-10
 Publication Status: Published in print
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Title: NPG Asia Materials
Source Genre: Journal
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Publ. Info: New York : Nature Publishing Group
Pages: - Volume / Issue: 14 (1) Sequence Number: 50 Start / End Page: 1 - 8 Identifier: ISSN: 1884-4049
CoNE: https://pure.mpg.de/cone/journals/resource/1884-4049