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The Electronic Spectra of Charge‐Ordered Crystals
Author(s) -
Ionov S. P.,
Lubimov V. S.,
Manakova L. A.,
Makarov E. F.
Publication year - 1977
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.2220810233
Subject(s) - charge (physics) , spectral line , isotropy , condensed matter physics , electron , kinetic energy , excitation , band gap , atomic physics , physics , materials science , quantum mechanics
The electronic excitation spectra for an isotropic charge‐ordered crystal are analysed on the basis of a band model. It is found that the charge‐ordered state is unstable relative to a transition into a state with pair correlation when the intra‐band attraction among the electrons exceeds a certain critical value which is a function of the kinetic energy and interaction parameters. In this situation a state is realized in which the charge order and the pair correlation are coexistent and which is possible at a finite value of the band width.