Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2005-05-30
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 2 figures
Scientific paper
We obtain the phase diagram of the double-exchange model at low electronic densities in the presence of electron-electron interactions. The single particle problem and its extension to low electronic densities, when a Wigner crystal of magnetic polarons is generated due to unscreened Coulomb interactions, is studied. It is argued that the Wigner crystal is the natural alternative to phase separation when the Coulomb interaction is taken into account. We discuss the thermal and quantum stability of the crystalline phase towards a polaronic Fermi liquid and a homogeneous, metallic, ferromagnetic phase. The relevance and application of our results to EuB_6 is also considered.
Castro Neto Antonio H.
dos Santos Joao M. B. Lopes
Pereira Vitor M.
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