Electron–Electron Interactions in Organic Superconductors

Abstract

Superconductivity in organic superconductors is still not properly understood. The normal state magnetism of examples of quasi‐1D,2D, and 3D organic superconductors is summarized and compared. In addition to the results of d.c. magnetization, magnetic susceptibility, and ESR measurements, the densities of states derived from measurements and from badn‐structure calculations are discussed. The importance of electron‐electron interactions for all molecular superconductors is outlined.

Pressure and temperature dependence of interlayer spin diffusion and electrical conductivity in the layered organic conductorsκ-(BEDT-TTF)2Cu[N(CN)2Antal1, Fehér2, Tátrai-Szekeres3 et al. 2011Phys. Rev. B202201View full textAdd to dashboardCite

“…7) and the DOS calculated in Ref. 25, we find t ⊥ = 0.06 meV, apparently in good agreement with low temperature angular magnetoresistance oscillation measurements 4 in a similar compound. However, Eq.…”

“…(5) with the above T x and ρ ⊥ values, the DOS of the correlated electron system has to be about 20 states/eV per two ET. Electron susceptibility and specific heat 25 and cyclotron frequency 27 measurements imply that at low temperatures the DOS is two to three times higher than predicted by band structure calculations. In our measurements, performed in the high temperature bad-metal phase, a factor of 4-5 larger DOS is needed to satisfy Eq.…”

Enhanced Physical Properties in a Pentacene Polymorph

“…Integrated intensities were collected with graphite-monochromatized Cu Ka radiation on an Enraf ± Nonius CAD-4 diffractometer, and the crystallographic analysis was carried out using the NRCVAX structure package. [17] In both cases, the valence bands show little dispersion, which is consistent with the observed intermolecular carbon ± carbon contacts above 3.6 . No other constraints were applied.…”

Synthesis, Structure, and Physical Properties of a Partial π‐Stacked Phenalenyl‐Based Neutral Radical Molecular Conductor

“…Such calculations have been very useful in understanding the electronic structure of organic molecular superconductors [38,39] and thinfilm field effect transistors [40] but cannot be expected to provide a complete picture of the electronic structure in situations where the tight-binding approximation is not applicable. Figure 8 shows the results obtained for band structure calculations carried out on the lattices found in the X-ray crystal structures.…”