Abstract
We report angle resolved photoemission measurements on Sr2CuO2Cl2,
an insulating layered copper oxide. We find that the overall width
of the highest occupied band and the position of the band maximum
at (π/2, π/2) agree with predictions of the t-J model and other calculations
based on the Hubbard model. However, in many regions of the Brillouin
zone, the shape of the band differs from these predictions. A comparison
of our data with spectra previously reported on metallic samples
leads to new suggestions for the phenomenology of doping.
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