Journal
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
Volume 249, Issue 5, Pages 937-942Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/pssb.201100750
Keywords
anion-donor interactions; charge density waves; charge ordering; organic conductors
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Funding
- ANR '3/4 - filled' [ANR-08-BLAN-0140]
- DGI-Spain [CSD2007-00041, FIS2009-12721-C04-03, CTQ2008-06670-C02-02/BQU]
- Generalitat de Catalunya [2009 SGR 1459]
- Agence Nationale de la Recherche (ANR) [ANR-08-BLAN-0140] Funding Source: Agence Nationale de la Recherche (ANR)
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The paper points out the importance of the coupling between anions and donors in order to achieve the 4kF charge localization observed in (TMTTF)2PF6, d-(EDT-TTF-CONMe2)2Br and (o-DMTTF)2Cl/Br salts, the 2kF charge density wave (CDW) ground state of a-(BEDT-TTF)2KHg(SCN)4 and the metal to insulator transition of a-(BEDT-TTF)2I3. This coupling leads to a cooperative displacement wave of the anions accompanied by a modulation of the density of p holes on the donors. We distinguish two principal aniondonor coupling mechanisms: a direct mechanism via the Hartree anion potential on donor sites and an indirect mechanism via the polarization of s 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.
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