No well-defined remnant Fermi surface in Sr2CuO2Cl2

Details No well-defined remnant Fermi surface in Sr2CuO2Cl2 No well-defined remnant Fermi surface in Sr2CuO2Cl2

2000-06-23

arxiv.org/abs/cond-mat/0006366v2

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures

Scientific paper

10.1103/PhysRevB.63.212501

In angle-resolved photoelectron spectra of the antiferromagnetic insulators Ca2CuO2Cl2 and Sr2CuO2Cl2 a sharp drop of the spectral intensity of the lowest-lying band is observed along a line in k space equivalent to the Fermi surface of the optimally doped high-temperature superconductors. This was interpreted as a signature of the existence of a remnant Fermi surface in the insulating phase of the high-temperature superconductors. In this paper it is shown that the drop of the spectral intensity is not related to the spectral function but is a consequence of the electron-photon matrix element

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