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.; Liu, Y.; Zhao, G. Q.; Zhang, J.; Liu, Q. Q.; Yu, R. Z.; Long, Y. W.; Wu, H.; Lin, H. J.; Chen, C. T.; Li, Z.; Gong, Z. Z.; Guguchia, Z.; Kim, J. S.; Stewart, G. R.; Uemura, Y. J.; Uchida, S.; Jin, C. Q.

doi:10.1073/pnas.1900908116

Superconductivity in a unique type of copper oxide

Journal Article · Mon May 20 00:00:00 EDT 2019 · Proceedings of the National Academy of Sciences of the United States of America

DOI:https://doi.org/10.1073/pnas.1900908116· OSTI ID:1610063

Li, W. M. ^[1]; Zhao, J. F. ^[2]; Cao, L. P. ^[2]; Hu, Z. ^[3]; Huang, Q. Z. ^[4]; Wang, X. C. ^[5]; Liu, Y. ^[2]; Zhao, G. Q. ^[2]; Zhang, J. ^[2]; Liu, Q. Q. ^[2]; Yu, R. Z. ^[5]; Long, Y. W. ^[5]; Wu, H. ^[4]; Lin, H. J. ^[6]; Chen, C. T. ^[6]; Li, Z. ^[7]; Gong, Z. Z. ^[8]; Guguchia, Z. ^[8]; Kim, J. S. ^[9]; Stewart, G. R. ^[9] more »

Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics; Materials Research Lab at Songshan Lake, Dongguan (China); DOE/OSTI
Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics
Max Planck Society, Dresden (Germany). Max Planck Inst. for Chemical Physics of Solids
National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics; Materials Research Lab at Songshan Lake, Dongguan (China)
National Synchrotron Radiation Research Center, Hsinchu (Taiwan)
Nanjing Univ. (China)
Columbia Univ., New York, NY (United States)
Univ. of Florida, Gainesville, FL (United States)
Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics; Univ. of Tokyo (Japan). Dept. of Physics

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-Tc cuprates are elongated along the c axis, leading to a 3dx²-y² 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 Ba₂CuO_4-y, wherein the local octahedron is in a very exceptional compressed version. The Ba₂CuO_4-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 Ba₂CuO_4-y superconductor. In compressed octahedron, the 3d3z²-r² orbital will be lifted above the 3dx²-y² orbital, leading to significant 3D nature in addition to the conventional 3dx²-y² orbital. This work sheds important light on advancing our comprehensive understanding of the superconducting mechanism of high T_c in cuprate materials.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Florida, Gainesville, FL (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: FG02-86ER45268

OSTI ID:: 1610063

Journal Information:: Proceedings of the National Academy of Sciences of the United States of America, Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Issue: 25 Vol. 116; ISSN 0027-8424

Publisher:: National Academy of SciencesCopyright Statement

Country of Publication:: United States

Language:: English

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The use of mixed-metal single source precursors for the synthesis of complex metal oxides Lu, Haijiao; Wright, Dominic S.; Pike, Sebastian D. Chemical Communications, Vol. 56, Issue 6 https://doi.org/10.1039/c9cc06258k	journal	January 2020
A different branch of the high T _c family? Scalapino, D. J. Proceedings of the National Academy of Sciences, Vol. 116, Issue 25 https://doi.org/10.1073/pnas.1907649116	journal	June 2019
Local structure of Sr ₂ CuO _3.3 , a 95 K cuprate superconductor without CuO ₂ planes Conradson, Steven D.; Geballe, Theodore H.; Jin, Changqing Proceedings of the National Academy of Sciences https://doi.org/10.1073/pnas.1918890117	journal	February 2020
Ni-based transition metal trichalcogenide monolayer: A strongly correlated quadruple-layer graphene Gu, Yuhao; Zhang, Qiang; Le, Congcong Physical Review B, Vol. 100, Issue 16 https://doi.org/10.1103/physrevb.100.165405	journal	October 2019
Relevance of Cu – 3 d multiplet structure in models of high- T c cuprates Jiang, Mi; Moeller, Mirko; Berciu, Mona Physical Review B, Vol. 101, Issue 3 https://doi.org/10.1103/physrevb.101.035151	journal	January 2020
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Ni-based transition-metal trichalcogenide monolayer: a strongly correlated quadruple-layer graphene Gu, Yuhao; Zhang, Qiang; Le, Congcong arXiv https://doi.org/10.48550/arxiv.1811.02333	text	January 2018

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