ANGLE-RESOLVED PHOTOELECTRON-SPECTROSCOPY ON THE FERMI-LIQUID REFERENCE COMPOUND TITE2

The layered compound TiTe2 can, for several reasons, be viewed as an i deal candidate for electron spectroscopic studies of Fermi liquid beha vior. High-resolution angle-resolved photoemission (ARPES) spectra nea r the Fermi energy reflect the expected energy renormalization and lif etime narrowing of the quasiparticle excitations. These results suppor t a many-body interpretation of ARPES on low-energy excitations in ter ms of the spectral function A(k,omega). We further present ARPES data measured in the constant energy mode and suggest a new method for obta ining precise information on the Fermi surface, which utilizes the dis continuity in the momentum distribution function of a Fermi liquid.