Topic
Bipolaron
About: Bipolaron is a research topic. Over the lifetime, 1335 publications have been published within this topic receiving 29154 citations. The topic is also known as: bipolarons.
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TL;DR: In this article, the value of the Frohlich electron-phonon interaction in manganites, cuprates, and some other charge-transfer insulators was calculated and it was shown that this interaction is much stronger than any relevant magnetic interaction.
Abstract: We calculate the value of the Frohlich electron-phonon interaction in manganites, cuprates, and some other charge-transfer insulators and show that this interaction is much stronger than any relevant magnetic interaction. A polaron shift due to the Frohlich interaction, which is about 1 eV, suggests that carriers in those systems are small (bi)polarons at all temperatures and doping levels, in agreement with the oxygen-isotope effect and other data. An opposite conclusion, recently suggested in the literature, is shown to be incorrect. The frequency and temperature dependence of the optical conductivity of ferromagnetic manganites is explained within the framework of the bipolaron theory.
37 citations
TL;DR: In this article, the shape and stability of polarons and bipolarons in oligothiophenes were studied systematically as a function of the oligomer length using first principles calculations and it was shown that the polaron is the stable charge carrier and that intrinsically the bipolaron is not stable with respect to separation into polarons.
37 citations
TL;DR: In this paper, the results of NMR and EPR studies are considered for large polyoxoanions of molybdenum and tungsten with paramagnetic and some diamagnetic centers which produce delocalized electrons.
37 citations
TL;DR: In this paper, the ground state in Ti4O7 and Fe3O4 is bipolaronic and the importance of elastic interaction between two localized electrons as the dominant interaction in such systems is emphasized.
Abstract: Charge localization in Ti4O7 and Fe3O4 and the respective insulating states are discussed It is concluded that the ground state in both systems is bipolaronic The concept of such a bipolaron is discussed and the importance of elastic interaction between two localized electrons as the dominant interaction in such systems is emphasized It is concluded that both systems above the long-range ordering temperature are to be considered as bipolaron glasses
37 citations
TL;DR: In this paper, simultaneous electrochemical measurements and EPR were carried out on polyaniline in ambient temperature molten salts, where half the total observed charge had been passed in both cyclic voltametry and potential step experiments.
Abstract: Simultaneous electrochemical measurements and EPR are carried out on polyaniline in ambient temperature molten salts. Maximum EPR response was where half the total observed charge had been passed in both cyclic voltametry and potential step experiments. The number of spins observed and electrons removed were 1:1 to about 25% of full oxidation. Two unresolved one-electron steps are used to explain the experiments with neutral, polaron, and bipolaron thermodynamic equilibrium. Reduced and oxidized form equilibrium constants change with the film`s ionic environment and conductivity. Doping stage dominance and EPR decay response of the polaron are also determined. 32 refs., 10 figs.
36 citations