Abstract
Local-density-calculations of the electronic structure of ${\mathrm{HgBa}}_{2}$${\mathrm{CuO}}_{4}$ have been performed with the self-consistent linear muffin-tin orbital method. The positron-density distribution and its sensitivity due to different potentials are calculated. The annihilation rates are computed in order to study the chemical bonding and to predict the Fermi-surface signal. Comparisons are made with previous calculations on other high-${\mathit{T}}_{\mathit{c}}$ copper oxides concerning the Fermi-surface properties and electron-positron overlap. We discuss the possibility of observing the Fermi surface associated with the Cu-O planes in positron-annihilation experiments.
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