The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The electronic properties of TTF-TCNQ and related 1 D conductors are reviewed in the context of the structural data which has established the incommensurate charge density wave ground state and soft-mode fluctuations associated with the Peierls instability. The frequency-dependent complex conductivity, the distribution of electronic oscillator strength, and the magnetic properties are discussed in...
We point out that in Id metals the transport mechanisms described by sliding incommensurate charge density waves (T < TpMF) and phonon drag (T > TpMF) are closely related.The two descriptions of the coupled electron-2k F phonon system merge naturally into one another at the mean field Peierls temperature, TpMF.
We describe an ESR study of pure and irradiated TTF-TCNQ in the low temperature range (1. 2 K − 4. 2 K) where nonlinear transport has been observed. We find no evidence of an activated term in the susceptibility; our results yield an upper limit of about 10 ppm for nonmagnetic impurities with a spin-1 excited state. Since in pure samples, the activated susceptibility term is not present whereas the...
Polyacetylene, (CH)x is the simplest organic polymer.Through chemical doping, the electrical conductivity of films of (CH)x can be varied over twelve orders of magnitude with properties ranging from insulator (σ < 10−10 ohm-1 cm-1 ) to semiconductor to metal (σ > 103 ohm−1 cm−1).Both donors and acceptors can be used with these flexible, free-standing polycrystalline polymer films (thickness...
The anisotropic metallic state and superconductivity of this quasi-onedimensional linear chain mercury compound are discussed, and the results of studies of the transport, magnetic and optical properties are reviewed.New results on the resistivity and magneto resistivity have been obtained using contactless ac mutual inductance techniques.These data imply a magnetic field induced residual resistivity...
Transport and magnetic studies of the phase transitions and low temperature charge density wave state in TTF-TCNQ as a function of induced defect concentration are presented.The transport results include a suppression and broadening of the phase transition and incomplete 3d ordering for T < 34 K, and are in agreement with a model in which the ld fluctuation coherence length is limited by random...
Die Hauptmerkmale elektronenakzeptierender Materialien mit einem 9,9′‐Bifluorenyliden‐Gerüst sind verringerte Ringspannungen und ein Zugewinn an Aromatizität. Die Dimere (siehe Bild) zeigen eine Absorption nahe dem roten Spektralbereich (ca. 600 nm) sowie HOMO‐ (5.58–5.06 eV) und LUMO‐Niveaus (3.37–3.09 eV), die die Materialien zusammen mit ihrer hohen Löslichkeit und thermischen Stabilität zu vielversprechenden...
Straining at the leash: The main features of electron‐accepting materials with a 9,9′‐bifluorenylidene backbone are strain relief and a gain in aromaticity. These dimers (see picture) exhibit absorption near the red spectral region (ca. 600 nm) and HOMO (5.58–5.06 eV) and LUMO (3.37–3.09 eV) energy levels, which, together with high solubility and thermal stability render these materials attractive...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.