Showing papers on "Bipolaron published in 1980"
TL;DR: In this paper, it was shown that pairs of conduction electrons in the low-temperature phase of crystalline WO3-x (x>or approximately=0.0001) are paired diamagnetically, forming bipolarons due to joint lattice distortion.
Abstract: Conduction electrons in the low-temperature phase of crystalline WO3-x (x>or approximately=0.0001) are found to be paired diamagnetically, forming bipolarons due to joint lattice distortion. They can be dissociated with light in a broad band of wavelengths peaked at 1.1 eV, as monitored by the appearance of W5+ ESR and a corresponding change in DC conductivity. The transport activation energy is 0.18 eV in the paired state and decreases upon dissociation. The bipolaron binding energy is larger than 0.36 eV. Separated electrons recombine in a bimolecular process controlled by diffusion in the conduction band.
87 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 article, a series of multiband tight-binding cluster calculations were made to further uncover the origin and nature of the intrinsic interface states at the Si-SiO2 interface as well as their effects on the n- and p-channel inversion layers.
5 citations
TL;DR: In this article, a model in which the low-temperature bipolaron ordered phase of Ti4O7 is suppressed with low concentrations of substitutional vanadium as a result of microdomain formation was proposed.
Abstract: We propose a model in which the low-temperature bipolaron ordered phase of Ti4O7 is suppressed with low concentrations of substitutional vanadium as a result of microdomain formation.
3 citations
TL;DR: In this paper, the exact solutions for the classical polaron model derived by Evrard et al. (the electron rotates about a fixed polaron centre with frequency Ω≫ω) exist also for the discrete frequencies Ω=ω/(n+ 1/2 )(ω is the longitudinal optical phonon frequency and n is an integer).
Abstract: It is shown that the exact solutions for the classical polaron model derived by Evrard et al. (the electron rotates about a fixed polaron centre with frequency Ω≫ω) exist also for the discrete frequencies Ω=ω/(n+ 1/2 )(ω is the longitudinal optical phonon frequency and n is an integer). For an infinite Brillouin zone radius the radius of the electron orbit is finite; this is in contrast with the behavior of the solutions found by Evrard et al., where the radius diverges with the Brillouin zone radius. Ringwood and Devreese have obtained the same set of solutions as proposed here with a different method. The present calculation shows clearly that the discrete frequencies arise as a consequence of the fact that the electron has to move in such a way that the different divergent contributions to the self‐interaction cancel each other. For the bipolaron system similar exact solutions are found. It is shown that the orbit frequency of the electrons, in the bipolaron system, can have the values Ω=ω/(2n+1).
1 citations