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, an electron paramagnetic resonance study of electron polarons in BaTiO3 and hole polarons (HP) was performed and their properties were determined by Jahn-Teller effects.
Abstract: An electron paramagnetic resonance study of electron polarons in BaTiO3 and hole polarons in BaTiO3 and KTaO3 is presented. Their properties are strongly determined by Jahn-Teller effects. There are three manifestations of electron polarons, including bipolarons. Hole polarons can exhibit static as well as dynamic Jahn-Teller coupling.
3 citations
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TL;DR: In this article, a quantum chemical view of charge transfer related to the Jahn-Teller effect involving two-electron functions (geminals) is compared with BCS theory, the Cooper pair, and Bipolaron theory.
3 citations
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3 citations
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31 Dec 2013TL;DR: The effect of nano-sized CoFe2O4 particles (10 nm in diameter) addition on the structure and the normal state transport properties of polycrystalline Bi-based superconductors were systematically studied as discussed by the authors.
Abstract: The effect of nano-sized CoFe2O4 particles (10 nm in diameter) addition on the structure and the normal state transport properties of polycrystalline Bi-based superconductors were systematically studied The additional amount, x wt%, of CoFe2O4 in this case varied from 00 to 1 wt% of the total mass of the sample Phase analysis by X-ray diffraction (XRD) and Electrical resistance as a function of temperature, ρ(T) were carried out Nano-sized particles addition modifies the electrical behavior of the normal state with increasing the CoFe2O4 concentration The bipolaron model can explain properly the normal state resistivity of the samples
3 citations
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TL;DR: In this article, the polaron, an electron dressed with HCB excitations, remains light even in the strong coupling limit as its effective mass remains of the order of the free electron mass, in contrast to the Holstein model where the electron effective mass increases exponentially with the electronphonon coupling.
Abstract: The polaron, an electron dressed with HCB excitations, remains light even in the strong coupling limit as its effective mass remains of the order of the free electron mass. This result is in a sharp contrast to the Holstein model where the electron effective mass increases exponentially with the electron-phonon coupling. HCB degrees of freedom mediate the attractive potential between two electrons that form a bound singlet bipolaron state at any non-zero coupling strength. In the low-frequency regime of the electron spectral function we observe a quasi-particle (QP) band that is separated from the continuum of states only in the central part of the Brillouin zone. The quasiparticle weight approaches zero as the QP band enters the continuum where it obtains a finite lifetime. At finite temperature an electron can annihilate thermally excited HCB's. Such thermally activated processes lead to a buildup of the spectral weight below the QP band. While the investigated model bears a resemblance with the Holstein model, we point out many important differences that originate from the binary HCB excitation spectrum, which in turn mimics spin-$1\over 2$ degrees of freedom
3 citations