Phase diagram of quarter-filled band organic salts [EDT-TTF-CONMe2]2X, X=AsF6 and Br.

Phase diagram of quarter - filled band organic salts , 1⁄2 EDT TTF CONMe 2 2 X , X 1⁄4 AsF 6 and

Infrared and Raman Studies of Charge Ordering in Organic Conductors, BEDT-TTF Salts with Quarter-Filled Bands

This paper reviews charge ordering in the organic conductors, β′′-(BEDT-TTF) (TCNQ), θ-(BEDT-TTF)2X, and α-(BEDT-TTF)2X. Here, BEDT-TTF and TCNQ represent bis(ethylenedithio)tetrathiafulvalene and 7,7,8,8-tetracyanoquinodimethane, respectively. These compounds, all of which have a quarter-filled band, were evaluated using infrared and Raman spectroscopy in addition to optical conductivity measu...

Magnetism and Pressure-Induced Superconductivity of Checkerboard-Type Charge-Ordered Molecular Conductor β-(meso-DMBEDT-TTF)2X (X = PF6 and AsF6)

The metallic state of the molecular conductor β-(meso-DMBEDT-TTF)2X (DMBEDT-TTF = 2-(5,6-dihydro-1,3-dithiolo[4,5-b][1,4]dithiin-2-ylidene)-5,6-dihydro5,6-dimethyl-1,3-dithiolo[4,5-b][1,4]dithiin, X = PF6, AsF6) is transformed into the checkerboard-type charge-ordered state at around 75–80 K with accompanying metalinsulator (MI) transition on the anisotropic triangular lattice. With lowering te...

ORGANIC SUPERCONDUCTIVITY - II Organic superconductors part of a generic phase diagram

Organic superconductors part of a generic phase diagram The Copenhagen group led by Klaus Bechgaard and experienced with the chemistry of selenium succeeded in the synthesis of a new series of conducting salts all based on the TMTSF molecule namely, (TMTSF)2X where X is an inorganic mono-anion with various possible symmetry, spherical (PF6, AsF6, SbF6, TaF6), tetrahedral (BF4, ClO4, ReO4) or tr...

4 J ul 2 00 6 1 Strong electronic correlations in superconducting organic charge transfer salts

We review the role of strong electronic correlations in quasi–twodimensional organic charge transfer salts such as (BEDT-TTF)2X, (BETS)2Y and β′-[Pd(dmit)2]2Z. We begin by defining minimal models for these materials. It is necessary to identify two classes of material: the first class is strongly dimerised and is described by a half-filled Hubbard model; the second class is not strongly dimeris...