Direct k-space photoemission imaging of the Fermi surface of Cu.

Abstract

A technique has been used to accurately measure the bulk Fermi surface of Cu. Photoemission images I(k,\ensuremath{\Elzxh}\ensuremath{\omega}${)}_{{\mathit{E}}_{\mathit{F}}}$ have been measured of the Fermi surface of Cu along two high symmetry k-space planes using constant initial-state spectroscopy. Many transitions from the Fermi surface were found to be adequately represented by free-electron final states over the entire photon energy range (10 -- 100 eV) measured. The shape of the Fermi surface is preserved in the photoemission images measured and could be transformed directly back into k space, revealing an accurate picture of the corresponding Fermi-surface cross sections. Good agreement was found between our results and previously reported de Haas--van Alphen measurements and a linear muffin-tin orbital calculation. \textcopyright{} 1996 The American Physical Society.