En las fronteras de la Materia Condensada

The different levels of hybridization of the 4f electron with the conduction band in Ce compounds give rise to a wide variety of magnetic and electronic properties which allows the analysis of different aspects of the e-e interactions. In particular, CeM₂Si₂ compounds and their alloys (M being a 3d or 4d transition metal) present different physical behaviors such as long range magnetic order, heavy fermion character, paramagnetism, non-magnetic order with magnetic correlations, and superconductivity among others. In this work we obtain the hybridization function, , of several CeM₂Si₂ systems performing ab-initio calculations. This function gives information about the energy distribution of the hybridization of the 4f state with the conduction band. We solve the Anderson Impurity Hamiltonian with the Non-Crossing Approximation taking as an input parameter. With this many body approach we study the crystal electric field splittings of the 4f level, the spectral properties and some aspects of the Kondo phenomena.