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Dynamical Susceptibility for Interacting Electrons in a Narrow Energy Band
Author(s) -
Nolting W.
Publication year - 1974
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220610106
Subject(s) - paramagnetism , ferromagnetism , condensed matter physics , electron , physics , electronic band structure , lattice (music) , magnetic susceptibility , magnetic moment , quantum mechanics , acoustics
An approximate expression for the dynamical susceptibility χ ( q , ω) of the paramagnetic phase of an interacting electron system in a narrow energy band is derived. The treatment is based on the “method of spectral moments”, χ ( q , ω) is used to look for instabilities of the paramagnetic state toward ferromagnetic ordering. If the number of electrons is less than the number of sites, χ ( q , ω) signals the possibility of two different types of ferromagnetism for both the s.c. and b.c.c. structure, while the paramagnetic system is stable for the f.c.c. structure. For the f.c.c.‐lattice a single ferromagnetic solution exists, if the band is more than half‐filled.