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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06 Jan 1984
TL;DR: In this paper, the authors present a new method of electrochemical polymerization of poly(thiophene) using dithiphene as the starting material, from which a high quality film with a sharp interband absorption edge is obtained.
Abstract: : This paper presents a new method of electrochemical polymerization of poly(thiophene) using dithiphene as the starting material, from which a high quality film with a sharp interband absorption edge is obtained. An in situ study of the absorption spectrum during the electrochemical doping process has been carried out. In the dilute regime, the results are in detailed agreement with charge storage via bipolarons; weakly confined soliton pairs with confinement parameter gamma = 0.1-0.2. At the highest doping levels, the data are characteristic of the free carrier absorption expected for a metal. From a parallel electrochemical voltage spectroscopy (EVS) study, we find evidence of charge injection near the band edge and charge removal from the bipolaron gap states. In the dilute regime, the position of the chemical potential is consistent with charge storage in weakly confined bipolarons. the high Coulombic recovery over a charge-discharge cycle indicates that poly(thiphene) may be an excellent cathode-active material in battery applications.
6 citations
TL;DR: In this article, a review is made of D-wave pairing in real space between electrons on a Cuprate lattice due to any effective interaction with a short range repulsive part and a longer range attractive tail such as might arise from Bipolaronic coupling.
Abstract: The question as to whether Fermion pairs interacting with a short range Coulomb repulsion and longer range attractive tail can form a Condensate is a key question for High Temperature Superconductivity [1–30] If such a form of interaction can support a bound state it is commonly suggested that Bose-Einstein condensation of such pairs may occur, as in widely discussed Bipolaron models of High Temperature Cuprate superconductivity where the paired Fermions are holes On the other hand it is frequently stated that strongly overlapping real-space pairing with a strong short range Coulomb repulsion is a priori implausible [4] In this paper a review is made of our work on D-wave pairing [7–19] in real-space between electrons on a Cuprate lattice due to any effective interaction with a short range repulsive part and a longer range attractive tail such as might arise from Bipolaronic coupling
6 citations
TL;DR: In this article, electron spin resonance and static susceptibility were measured for sulfur-linked aromatic hydrocarbons, and it was found that the unpaired electrons in the polymers are delocalized on the radical centers composed of the sulfur and carbon atoms associated with local distortion (polaron).
6 citations
TL;DR: In this paper, the superconducting properties of a system of localized electron pairs are determined by transport along a bipolaron band formed by localized pairs of carriers belonging to U− centers, i.e., intrinsic defects with a negative effective correlation energy.
Abstract: We propose a model in which the state with anomalously high conductivity observed in some lowcoordinated semiconductors and polymers when the temperature of the surrounding medium is T0≈300 K, is described by the theory of the superconducting properties of a system of localized electron pairs The superconducting properties of the model are determined by transport along a bipolaron band formed by localized pairs of carriers belonging to U− centers, ie, intrinsic defects with a negative effective correlation energy
6 citations
TL;DR: In this article, it was shown that the magnetic bipolaron can be formed if the distance between two polarons is less than some critical value, i.e., the critical radius is larger, the lower the temperature and the larger the polaron radius.
6 citations