K-RESOLVED ELECTRONIC-PROPERTIES OF TERNARY HEAVY-FERMION SYSTEMS

Electronic and structural properties of the heavy fermion intermetalli cs CePd2Si2 and CeNi2Ge2 were determined using the techniques of low-e nergy electron diffraction, electron-energy-loss spectroscopy (EELS) a nd resonant photoemission. Atomically clean and well-ordered surfaces were prepared by evaporating the corresponding crystal onto a W(110) c rystal. This preparation procedure allows the application of angle-res olved electron spectroscopic methods being sensitive to surface proper ties. The behavior of the rare-earth f states was determined by EELS. Resonant photoemission was carried out by tuneable synchrotron radiati on allowing a direct assignment of the orbital nature of the electron states hybridizing in the valence band as well as to distinguish betwe en states of the different constituents. [S0163-1829(98)02336-4].