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Angle-resolved photoemission experiments on Bi2Sr2CaCu2O8+δ(001)

Effects of the incommensurate lattice modulation

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Abstract

Core-level X-ray photoelectron-diffraction patterns have been measured from cleaved Bi2Sr2CaCu2O8+δ (001) surfaces for all elements present in this compound. The incommensurate modulation alongb ([010]) leads to a strong inequivalence ofa- andb-directions for Bi, Sr and Cu photoelectrons, while Ca and O emission show less effect. Ultraviolet-photoemission experiments recording the emission intensity at the Fermi energy over a large solid angle are also presented, providing a direct mapping of the Fermi surface. Ac(2×2) superstructure is observed on the Fermi surface suggesting antiferromagnetic correlations within the Cu−O planes. The effects of the lattice modulation are clearly observable at the Fermi energy, and they are enhanced for binding energies higher than a few tens of meV.

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Osterwalder, J., Aebi, P., Schwaller, P. et al. Angle-resolved photoemission experiments on Bi2Sr2CaCu2O8+δ(001). Appl. Phys. A 60, 247–254 (1995). https://doi.org/10.1007/BF01538399

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