Superconductivity in fullerides

  title={Superconductivity in fullerides},
  author={Olle Gunnarsson},
  journal={Reviews of Modern Physics},
  • O. Gunnarsson
  • Published 20 November 1996
  • Physics
  • Reviews of Modern Physics
Experimental studies of the superconductive properties of fullerides are briefly reviewed. Theoretical calculations of the electron-phonon coupling, in particular for the intramolecular phonons, are discussed extensively. The calculations are compared with coupling constants deduced from a number of different experimental techniques. It is discussed why A{sub 3}C{sub 60} are not Mott-Hubbard insulators, in spite of the large Coulomb interaction. Estimates of the Coulomb pseudopotential {mu}{sup… 
The electronic structure and the superconductivity in field-doped polyacenes are considered. Within a modified Thomas–Fermi approach for typical experimental values of the surface charge density the
Superconductivity in Doped C60 Compounds
It is discussed why A3C60 (A =K, Rb) are metals and not Mott-Hubbard insulators, in spite of the strong Coulomb repulsion U. It is shown that the orbital degeneracy N of the t 1u band increases the
Superconductivity in the Alkali-Doped Fullerides: Competition of Phonon-Mediated Attractions with Coulomb Repulsions in Polaron Pairing
The mechanism of superconductivity in the alkali-metal-doped fullerides is investigated theoretically based on the Hubbard–Holstein model. Salient observed features such as the anomalous? C isotope
Nonadiabatic superconductivity in fullerene-based materials
Fullerene compounds have phonon frequencies up to ωmax=0.2 eV and a Fermi energy of the order EF=0.3 eV. It is, therefore, expected that the adiabatic parameter λωph/EF (where λ is the
Nonempirical study of superconductivity in alkali-doped fullerides based on density functional theory for superconductors
We apply the density functional theory for superconductors (SCDFT) based on the local-density approximation (LDA) to alkali-doped fullerides A3C60 with the face-centered cubic structure. We evaluate
Fulleride superconductivity compared and contrasted with RVB theory of high Tc cuprates
Recently we proposed a microscopic mechanism for alkali-metal doped Fulleride superconductivity. The aim of the current study is to compare and contrast such Fulleride superconductivity with that of
Transport properties of alkali metal doped fullerides
We have studied the intercage interactions between the adjacent C60 cages and expansion of lattice due to the intercalation of alkali atoms based on the spring model to estimate phonon frequencies
Analysis of Possible Field-Induced Superconductivity in Anthracene, Other Polyacenes, and C60
We consider electronic structure and superconductivity aspects in field-doped polyacenes (PA) and C60. Within a modified Thomas–Fermi approach for typical experimental values of the surface charge
Anomalous isotope effects of fulleride superconductors
The numerical calculations of the standard Eliashberg-Nambu strong coupling theory and a formula of isotope effect derived in this paper provide direct evidences that an-harmonic vibrations of
Localization and Superconductivity in Intercalated Fullerenes
The model of superconductivity in the intercalated fullerenes based on arising of the valence bond between two neighbouring alkali-metal atoms is proposed. This model explains all the currently


Calculation of the superconducting critical temperature in doped fullerenes.
The Eliashberg equations are solved by taking properly into account that the Fermi energy is comparable to the on-molecule phonon energies, and results for the dopant and pressure dependence are presented.
Consequences of extended-range interactions in the correlation-induced model of superconductivity in the fullerenes.
  • Goff, Phillips
  • Physics
    Physical review. B, Condensed matter
  • 1993
The consequences of extended interactions on the charged-fullerene ground states, the binding energies, the critical U necessary for pair binding, a nonphononic isotope effect, and the renormalization of the Coulomb pseudopotential parameter μ * are presented.
Superconductivity in the Fullerenes
It is predicted that high frequency H2 modes acquire a width of about 20% of their frequency in superconductive fullerenes, and soften by about 5% compared to the insulating fullererenes.
Superconductivity of Doped Fullerenes
We consider the π-electrons on the surface of a single molecule of C60 (fullerene) interacting via an on-site repulsive interaction U. We show that, for a large range of parameters, the energy to add
Electronic States of KxC60: Insulating, Metallic, and Superconducting Character
Theoretical analysis indicates that KxC60 is a strong coupling superconductor, and it is suggested that the enhanced electron-phonon interaction is related to the unique hybridization of the C sp-derived states.
Electronic Correlation Effects and Superconductivity in Doped Fullerenes
A theory of the electronic properties of doped fullerenes is proposed in which electronic correlation effects within single fullerene molecules play a central role, and qualitative predictions are
Metallic screening and correlation effects in superconducting fullerenes.
The frequency dependence of screening substantially reduces the effects of the long-range part of the Coulomb interaction, leading to the possibility of effective attraction between electrons.
Theory of Nonadiabatic Superconductivity
All high-temperature superconductors (and especially the C60 compounds) are characterized by a small Fermi energy (EF), of the order of the maximum phonon frequency (?D). We generalize therefore the
Role of electron Coulomb interaction in superconductivity
The effect of the dynamically screened electron-electron interaction on the superconducting transition temperature is investigated by solving the Eliashberg equation in both frequency and momentum