Energy spectrum of the organic quasi-1D conductors with NNN and correlated hopping

• Published in: Condensed Matter Physics
• Date: 2006
• Main Authors: Skorenkyy, Yu., Kramar, O.
• Format: Article
• Language: English
• Published: Інститут фізики конденсованих систем НАН України 2006
• Online Access: https://nasplib.isofts.kiev.ua/handle/123456789/121310
• Journal Title: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Cite this: Energy spectrum of the organic quasi-1D conductors with NNN and correlated hopping / Yu. Skorenkyy, O. Kramar // Condensed Matter Physics. — 2006. — Т. 9, № 1(45). — С. 161–168
 . — Бібліогр.: 45 назв. — англ.

A model for organic quasi-one-dimensional conductors (TMTTF)₂X and (TMTSF)₂X is considered. The anisotropic
 character of these compounds is modelled by two different hopping parameters: t between nearest
 neighbors (NN) in a chain of tetramethyl-tetrathiafulvalene (TMTTF) or tetramethyl-tetraselenfulvalene
 (TMTSF) molecules and t' between the chains (NNN - between next nearest neighbors). Taking into account
 the correlated hopping of electrons allows us to describe the effect of site occupancy on hopping processes.
 In a regime of strong intraatomic correlation, high energy processes are cut off by applying two successive
 canonical transformations. An effective model is obtained for concentration of electrons n < 1 which contains
 kinetic exchange terms of antiferromagnetic (AF) nature. Oppositely, NNN hopping and correlated hopping
 disfavor the AF order. The energy spectrum of the effective model is calculated. Application of the obtained
 results to quasi-one-dimensional conductors is discussed.