Analysis of possible field-induced superconductivity in anthracene, other polyacenes, and C60

TL;DR

This paper investigates the potential for field-induced superconductivity in polyacenes and C60 by analyzing electronic structures and electron-phonon interactions, suggesting Coulomb pseudopotentials influence critical temperature differences.

Contribution

It provides a theoretical analysis of superconductivity mechanisms in field-doped polyacenes and C60, incorporating a modified Thomas-Fermi approach and LDA band structure calculations.

Findings

Injected charge is confined to a monolayer at typical experimental surface charge densities.

Electron-phonon coupling constants are estimated for internal modes.

Differences in Tc-values are attributed to Coulomb pseudopotential variations.

Abstract

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 density the injected charge is confined to a monolayer. The electron-phonon coupling constant for internal modes is estimated using the work of Devos et al. (Phys. Rev. B 58, 8236 (1998)) and the density of states N(0) estimated from a 2D-one-band model derived from a full potential LDA band structure calculation for bulk anthracene. The large differences in the reported Tc-values for n-doped PA and C60 are ascribed to enhanced empirical Coulomb pseudopotentials for polyacenes.