Resolving Fermi surface jumps in positron spectroscopy by a subtractionless method

The paper discusses a subtractionless method of identification of Fermi surface sheets from n-axis-projected momentum distribution histograms measured by the technique of two-dimensional angular correlation of the positron-electron annihilation radiation (2D-ACAR). The analysis of a gigacount 2D-ACAR spectrum, measured on the archetypal high-Tc compound YBa2Cu3O7-δ at room temperature, at the ridge along ΓX direction and the pillbox centered at the S point of the first Brillouin zone, are resolved. (authors)