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• W2611299969 abstract "The topics of the thesis concerns two theoretical aspects of the physics of 4f electron systems. In the first part the topic of intermediate valence and valence transitions in lanthanide systems is explored. For that purpose, we study an extended version of the Periodic Anderson Model which includes the Coulomb interaction between conduction electrons and the localized f electrons (Falicov-Kimball interaction). If it is larger than a critical value, this interaction can transform a smooth valence change into a discontinuous valence transition. The model is treated in a combination of Hubbard-I and mean-field approximations, suitable for the energy scales of the problem. The zero temperature phase diagram of the model is established. It shows the evolution of the valence with respect to the model parameters. Moreover, the effects of an external magnetic field and ferromagnetic interactions on the valence transitions are investigated. Our results are compared to selected Yb- and Eu-based compounds, such as YbCu_2Si_2, YbMn_6Ge_{6−x}Sn_x and Eu(Rh_{1−x}Ir_x)_2Si_2.In the second part of the thesis, we study lanthanide systems in which the number of local magnetic atoms is tuned by substitution of non-magnetic atoms, also known as Kondo Alloys. In such systems it is possible to go from the single Kondo impurity to the Kondo lattice regime, both characterized by different type of Fermi liquids. The Kondo Alloy model is studied within the Statistical Dynamical Mean-Field Theory, which treats different aspects of disorder and is formally exact in a Bethe lattice of any coordination number. The distributions of the mean-field parameters, the local density of states and other local quantities are presented as a function of model parameters, in particular the concentration of magnetic moments x, the number of conduction electrons per site nc and the Kondo interaction strength JK . Our results show a clear distinction between the impurity (x ≪ 1) and the lattice (x ≈ 1) regimes for a strong Kondo interaction. For intermediate concentrations (x ≈ nc), the system is dominated by disorder effects and indications of Non-Fermi liquid behavior and localization of electronic states are observed. These features disappear if the Kondo interaction is weak. We further discuss the issue of low dimensionality and its relation to the percolation problem in such systems." @default.
• W2611299969 created "2017-05-12" @default.
• W2611299969 creator A5053200466 @default.
• W2611299969 date "2016-03-23" @default.
• W2611299969 modified "2023-09-26" @default.
• W2611299969 title "Theory of lanthanide systems: valence transitions and Kondo effect in the presence of disorder" @default.
• W2611299969 hasPublicationYear "2016" @default.
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