Abstract
We have carried out 2D-ACAR measurements in the c-axis projection on an untwinned single crystal of YBa 2Cu 3O 7− x as a function of temperature, for five temperatures ranging from 30 K to 300 K. These temperature dependent 2D-ACAR spectra can be approximated by a superposition of two temperature independent spectra with temperature dependent weighting factors. We discuss how the temperature dependence of the data can be exploited to obtain a “background corrected” experimental spectrum, which is found to be in remarkable accord with the corresponding band theory based predictions, including for the first time the overall amplitude of the anisotropy in the 2D-ACAR. The corrected data also shows clear signatures of the ridge Fermi surface and an indication of the pillbox surface.
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