The nature of a metal-insulator and magnetic transitions is still a subject under intense
debate in condensed-matter physics. Among the many possible mechanisms, the interplay …

The competition between antiferromagnetic (AF) order and singlet formation is a central
phenomenon of the Kondo and periodic Anderson Hamiltonians and of the heavy fermion …

We analyze the magnetically ordered phases in the Kondo lattice model on a square lattice
around quarter filling using the dynamical mean field theory. We find that close to quarter …

The Kondo and periodic Anderson model (PAM) are known to provide a microscopic picture
of many of the fundamental properties of heavy-fermion materials and, more generally, a …

The phase diagram of the Kondo lattice model is explored around the ferromagnetic region,
including an external magnetic field, and allowing the coexistence of ferromagnetism and …

Using the combination of a new effective Hamiltonian approach and hybrid Monte-Carlo
simulations, we unveil a variety of partially magnetically ordered (PMO) phases in the Kondo …

The nature of superconductivity in heavy-fermion materials is a subject under intense
debate, and controlling this many-body state is central for its eventual understanding. Here …

Although the complicated interaction between electrons makes it impossible to directly
calculate the properties of realistic condensed systems, for large classes of metallic …

n this thesis, we will study f-electron systems under two different aspects: the formation and
the breakdown of lattice coherence, and the nature of f-electrons, which can be either …

The nature of superconductivity in heavy-fermion materials is a subject under intense
debate, and controlling this many-body state is central for its eventual understanding. Here …