期刊
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
卷 33, 期 1, 页码 81-85出版社
SPRINGER
DOI: 10.1007/s10948-019-05302-6
关键词
Unconventional cuprates; Compressed octahedron; High pressure
资金
- Ministry of Science and Technology(MOST)
- Natural Science Foundation (NSF) of China
- Max Planck Institute (MPI)
- US NSF
- US Department of Energy, Bureau of Energy Sciences
A new Ba2CuO4-y superconductor with critical temperature (T-c) 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-T-c 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 Cu3d3z(2)-r(2) orbital level will be lifted above the Cu3dx(2)-y(2) 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.
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