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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01 Apr 2006
1 citations
TL;DR: In this paper, the polaron formation in trans-polyacetylene as well as polyyne chains is investigated in the framework of the finite-band scheme and the physical characteristics of polarons (spin, charge, formation energy, width, binding energy) are calculated.
Abstract: The polaron formation in trans-polyacetylene as well as polyyne chains is investigated in the framework of the finite-band scheme The physical characteristics of polarons (spin, charge, formation energy, width, binding energy) are calculated The bipolaron, tripolaron, and polarexciton states in polyyne are considered A self-consistent discrete analysis of polaron states is presented Comparison between the finite-band and discrete calculations is done
[Russian Text Ignored]
1 citations
TL;DR: In this article, the results of a dc transport and optical investigation of WO3 and NaxWO3 with x=0.01 were presented, with the possible formation of polarons and bipolarons.
Abstract: We present the results of a dc transport and optical investigation of WO3 and NaxWO3 with x=0.01. Upon Na-doping we find a (Drude) metallic component in the optical conductivity, while the transport data display a crossover from an activated to a variable range hopping regime around 210 K. We suggest the possible formation of polarons (and bipolarons) and speculate that superconductivity could be induced, provided the dc percolation threshold is achieved.
1 citations
TL;DR: In this article, the thermodynamic properties of a three-dimensional Bose-condensate of translation-invariant bipolarons (TI-bipolarons) were investigated.
Abstract: Consideration is given to thermodynamical properties of a three-dimensional Bose-condensate of translation-invariant bipolarons (TI-bipolarons). The critical temperature of transition, energy, heat capacity and the transition heat of TI-bipolaron gas are calculated. The results obtained are used to explain experiments on high-temperature superconductors.
1 citations
TL;DR: In this article, a large-bipolaron in p-doped La2CuO4 is modeled as two electrons being removed from the out-of-plane orbitals of four oxygen ions circumscribed by four copper ions of a CuO2 layer.
Abstract: Planar large-bipolarons can form if the ratio of the surrounding mediums static to high-frequency dielectric constants is especially large. A large-bipolaron in p-doped La2CuO4 is modeled as two electrons being removed from the out-of-plane orbitals of four oxygen ions circumscribed by four copper ions of a CuO2 layer. These oxygen dianions relax inwardly as they donate electrons to the surrounding outwardly relaxing copper cations. This charge transfer generates the strong in-plane electron-lattice interaction needed to stabilize a large-bipolaron with respect to decomposing into polarons. The lowest-energy radial in-plane optic vibration of a large-bipolarons four core oxygen ions with their associated electronic charges has d-symmetry. Electronic relaxation in response to multiple large-bipolarons atomic vibrations lowers their frequencies to generate a phonon-mediated attraction among them which fosters their condensation into a liquid. This liquid features distinctive transport and optical properties. A large-bipolaron liquids superconductivity can result when it undergoes a Bose condensation yielding macroscopic occupation of its ground-state. The synchronized vibrations of large-bipolarons core-oxygen ions with their electronic charges generate this Bose condensates dynamic global d-symmetry.
1 citations