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Charge ordering in low dimensional organic conductors: Structural aspects
Author(s) -
Pouget JeanPaul,
FouryLeylekian Pascale,
Alemany Pere,
Canadell Enric
Publication year - 2012
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.201100750
Subject(s) - ion , chemistry , charge density wave , crystallography , polarization (electrochemistry) , charge density , metal , charge ordering , chemical physics , coupling (piping) , ground state , charge (physics) , computational chemistry , condensed matter physics , molecular physics , inorganic chemistry , materials science , atomic physics , physics , organic chemistry , superconductivity , quantum mechanics , metallurgy
The paper points out the importance of the coupling between anions and donors in order to achieve the 4 k F charge localization observed in (TMTTF) 2 PF 6 , δ ‐(EDT‐TTF‐CONMe 2 ) 2 Br and (o‐DMTTF) 2 Cl/Br salts, the 2 k F charge density wave (CDW) ground state of α‐(BEDT‐TTF) 2 KHg(SCN) 4 and the metal to insulator transition of α‐(BEDT‐TTF) 2 I 3 . This coupling leads to a cooperative displacement wave of the anions accompanied by a modulation of the density of π holes on the donors. We distinguish two principal anion–donor coupling mechanisms: a direct mechanism via the Hartree anion potential on donor sites and an indirect mechanism via the polarization of σ bonds activated by the modification of the H bonds network. Both kinds of interaction are tuned by the relative displacement of the anions with respect to the donors.