Tunable Polaronic Conduction in AnataseTiO2

Tunable polaronic conduction in anatase TiO2.

Oxygen vacancies created in anatase TiO(2) by UV photons (80-130 eV) provide an effective electron-doping mechanism and induce a hitherto unobserved dispersive metallic state. Angle resolved photoemission reveals that the quasiparticles are large polarons. These results indicate that anatase can be tuned from an insulator to a polaron gas to a weakly correlated metal as a function of doping and...

Nonadiabatic polaronic superconductivity in MgB2 and cuprates

v 1 1 9 Se p 19 96 Hall - Effect Sign Anomaly and Small - Polaronic Conduction in (

Electrical conductivity anomaly in silver vadadium-tellurite glasses at temperatures higher than a characteristic temperature: evidence for an ionic-nonadiabatic polaronic mixed conduction

Electrical conduction anomaly was observed in the mixed ion-polaron regime for xAg2O-40TeO2-(60-x)V2O5 glassy system with 0 ≤x≤ 50 mol%, which were prepared by common melt quenching method. For the understudied glasses, the temperature dependence of dc electrical conductivity was measured from a characteristic temperature to 380 K, which certified their semiconducting nature. The measured condu...

Cotunnelling and polaronic effect in granular systems

We theoretically study the conductivity in arrays of metallic grains due to the variable-range multiple cotunneling of electrons with short-range (screened) Coulomb interaction. The system is supposed to be coupled to random stray charges in the dielectric matrix that are only loosely bounded to their spatial positions by elastic forces. The flexibility of the stray charges gives rise to a pola...