ELECTRONIC-STRUCTURE OF THE MERCURY-BASED HIGH-TC COMPOUND WITH 4 CUO2 LAYERS - HGBA2CAN-1CUNO2N+2 (N=4)

The electronic structure of the tetragonal mercury-based compound cont aining four CuO2 planes, HgBa2Ca3Cu4O10 (Hg1234), has been made from f irst principles, within the local-density approximation using the full potential linear muffin-tin orbital method. The Hg-derived band which dopes the CuO2 planes dips further below the Fermi energy than in the compounds with n = 2 and 3 planes (this band stays above the Fermi en ergy for n = 1), increasing the degree of Hg character of all sheets o f the Fermi surface.