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Iowa State University

2001

Physics and Astronomy Publications

Antiferromagnetic insulators

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Full-Text Articles in Physics

No Well-Defined Remnant Fermi Surface In Sr2cuo2cl2, S. Haffner, D. P. Brammeier, C. G. Olson, L. L. Miller, David W. Lynch Apr 2001

No Well-Defined Remnant Fermi Surface In Sr2cuo2cl2, S. Haffner, D. P. Brammeier, C. G. Olson, L. L. Miller, David W. Lynch

Physics and Astronomy Publications

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.