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- Title
The Unconventional Copper Oxide Superconductor with Conventional Constitution.
- Authors
Li, W. M.; Zhao, J. F.; Cao, L. P.; Hu, Z.; Huang, Q. Z.; Wang, X. C.; Yu, R. Z.; Long, Y. W.; Wu, H.; Lin, H. J.; Chen, C. T.; Gong, Z. Z.; Guguchia, Z.; Kim, J. S.; Stewart, G. R.; Uemura, Y. J.; Uchida, S.; Jin, C. Q.
- Abstract
A new Ba2CuO4-y superconductor with critical temperature (Tc) exceeding 70 K was discovered. The X-ray absorption measurement gives evidence that this cuprate resembles La2CuO4 but is doped with a fairly large amount of holes, while in contrast to the so far known hole-doped high-Tc cuprates, the new cuprate possesses a much shorter local apical oxygen distance as well as much expanded in-plane Cu–O bond, leading to unprecedented compressed local octahedron. In compressed local octahedron, the Cu3d3z2–r2 orbital level will be lifted above the Cu3dx2-y2 orbital level with more three-dimensional features, implying that pairing symmetry may carry admixtures from more than one gap, suggesting that Ba2CuO4-y composed of alkaline earth copper oxides that are the essential elements to form cuprate superconductors may belong to a new branch of cuprate superconductors.
- Subjects
MAGNESIUM diboride; HIGH temperature superconductors; SUPERCONDUCTORS; ALKALINE earth oxides; ALKALINE earth metals; CUPRATES; COPPER oxide; X-ray absorption
- Publication
Journal of Superconductivity & Novel Magnetism, 2020, Vol 33, Issue 1, p81
- ISSN
1557-1939
- Publication type
Article
- DOI
10.1007/s10948-019-05302-6