期刊
PHYSICAL REVIEW B
卷 80, 期 10, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.100505
关键词
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资金
- Director Office for Basic Energy Sciences, (U.S.) DOE
- Swiss NCCR MaNEP
- Department of Energy-Basic Energy Sciences [DE-AC02-07CH11358]
- Swiss National Science Foundation
- K. Alex Muler Foundation
We use microprobe angle-resolved photoemission spectroscopy to study the Fermi surface and band dispersion of the CuO2 planes in the high-temperature superconductor, YBa2Cu4O8. We find a strong in-plane asymmetry of the electronic structure between directions along a and b axes. The saddle point of the antibonding band lies at a significantly higher energy in the a direction (pi, 0) than the b direction (0, pi), whereas the bonding band displays the opposite behavior. We demonstrate that the abnormal band shape is due to a strong asymmetry of the bilayer band splitting, likely caused by a nontrivial hybridization between the planes and chains. This asymmetry has an important implication for interpreting key properties of the Y-Ba-Cu-O family, especially the superconducting gap, transport, and results of inelastic neutron scattering.
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