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Gruppo fotografico dei partecipanti al Corso fuori testo W M Lomer Band theory and magnetism 1 The itinerant electron picture pag
The exchange interaction
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alloys analytic Anderson model antiferromagnetic approximation assume asymptotic atomic orbital average band structure bound boundary Brillouin zone calculation cell complex computed conduction band conduction electrons contribution correct correlation corresponding Coulomb coupling covalent admixture curve d-band depends discussed effect elec electron gas equation exchange energy exchange interaction factor Fermi energy Fermi level Fermi surface ferromagnetic finite Friedel given gives Green function Green's Hamiltonian Hartree-Fock host metal impurity atom integral Journ Kondo lattice localized moments magnetic matrix elements momentum multiple-scattering neutron nonmagnetic number of electrons obtained operator orbital paramagnetic perturbation theory phase shift Phys physical poles potential problem qualitative quasi-particle real axis resonance screening charge Sect self-consistent solution spherical spin polarization spin wave symmetry temperature tight-binding tion transition metals trons unperturbed vector wave functions width zero