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  Superconductivity in a unique type of copper oxide

Li, W. M., Zhao, J. F., Cao, L. P., Hu, Z., Huang, Q. Z., Wang, X. C., et al. (2019). Superconductivity in a unique type of copper oxide. Proceedings of the National Academy of Sciences of the United States of America, 116(25), 12156-12160. doi:10.1073/pnas.1900908116.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0003-F704-2 Version Permalink: http://hdl.handle.net/21.11116/0000-0003-F706-0
Genre: Journal Article

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 Creators:
Li, W. M.1, Author
Zhao, J. F.1, Author
Cao, L. P.1, Author
Hu, Z.2, Author              
Huang, Q. Z.1, Author
Wang, X. C.1, Author
Liu, Y.1, Author
Zhao, G. Q.1, Author
Zhang, J.1, Author
Liu, Q. Q.1, Author
Yu, R. Z.1, Author
Long, Y. W.1, Author
Wu, H.1, Author
Lin, H. J.1, Author
Chen, C. T.1, Author
Li, Z.1, Author
Gong, Z. Z.1, Author
Guguchia, Z.1, Author
Kim, J. S.1, Author
Stewart, G. R.1, Author
Uemura, Y. J.1, AuthorUchida, S.1, AuthorJin, C. Q.1, Author more..
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: The mechanism of superconductivity in cuprates remains one of the big challenges of condensed matter physics. High-T-c cuprates crystallize into a layered perovskite structure featuring copper oxygen octahedral coordination. Due to the Jahn Teller effect in combination with the strong static Coulomb interaction, the octahedra in high-T-c cuprates are elongated along the c axis, leading to a 3dx(2)-y(2) orbital at the top of the band structure wherein the doped holes reside. This scenario gives rise to 2D characteristics in high-T-c cuprates that favor d-wave pairing symmetry. Here, we report superconductivity in a cuprate Ba2CuO4-y,wherein the local octahedron is in a very exceptional compressed version. The Ba2CuO4-y compound was synthesized at high pressure at high temperatures and shows bulk superconductivity with critical temperature (T-c) above 70 K at ambient conditions. This superconducting transition temperature is more than 30 K higher than the T-c for the isostructural counterparts based on classical La2CuO4. X-ray absorption measurements indicate the heavily doped nature of the Ba2CuO4-y superconductor. In compressed octahedron, the 3d3z(2)-r(2) orbital will be lifted above the 3dx(2)-y(2) orbital, leading to significant 3D nature in addition to the conventional 3dx(2)-y(2) orbital. This work sheds important light on advancing our comprehensive understanding of the superconducting mechanism of high T-c in cuprate materials.

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Language(s): eng - English
 Dates: 2019-05-202019-05-20
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1073/pnas.1900908116
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Title: Proceedings of the National Academy of Sciences of the United States of America
  Other : Proc. Acad. Sci. USA
  Other : Proc. Acad. Sci. U.S.A.
  Other : Proceedings of the National Academy of Sciences of the USA
  Abbreviation : PNAS
Source Genre: Journal
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Publ. Info: Washington, D.C. : National Academy of Sciences
Pages: - Volume / Issue: 116 (25) Sequence Number: - Start / End Page: 12156 - 12160 Identifier: ISSN: 0027-8424
CoNE: https://pure.mpg.de/cone/journals/resource/954925427230