Absence of photoemission from the Fermi level in potassium intercalated picene and coronene films: structure, polaron or correlation physics?

Abstract

The electronic structure of potassium intercalated picene and coronene films has been studied using photoemission spectroscopy. Picene has additionally been intercalated using sodium. Upon alkali metal addition core level as well as valence band photoemission data signal a filling of previously unoccupied states of the two molecular materials due to charge transfer from potassium. In contrast to the observation of superconductivity in K_xpicene and K_xcoronene (x ~ 3), none of the films studied shows emission from the Fermi level, i.e. we find no indication for a metallic ground state. Several reasons for this observation are discussed.

15 pages, 6 figures

References in corpus (18)

• Superconductivity in Fullerides
• Electronic Correlation effects in superconducting picene from ab-initio calculations
• Intercalant and intermolecular phonon assisted superconductivity in K-doped picene
• Electron-phonon coupling in crystalline Pentacene films
• Strong Correlations in Electron Doped Phthalocyanine Conductors Near Half Filling
• Vibrational spectrum and electron-phonon coupling of doped solid picene from first principles
• Density functional calculations of the electronic structure and magnetic properties of the hydrocarbon K3picene superconductor near the metal-insulator transition
• First-principles structural optimization and electronic structure of the superconductor picene for various potassium doping levels
• Electronic structure and correlations in pristine and potassium doped Cu-Phthalocyanine molecular crystals
• Crystal structure and electronic states of tripotassium picene
• Electronic properties of molecular solids: the peculiar case of solid Picene
• Electronic structure of solid coronene: differences and commonalities to picene
• Electronic structure of pristine and K-doped solid picene: Non-rigid-band change and its implication for electron-intramolecular-vibration interaction
• HOMO band structure and anisotropic effective hole mass in thin crystalline Pentacene films
• Evidence for Insulating Behavior in the Electric Conduction of (NH${}_3$)K${}_3$C${}_{60}$ Systems
• Electronic structure of undoped and potassium doped coronene investigated by electron energy-loss spectroscopy
• Exciton character in picene molecular solids
• Dynamic response and electronic structure of potassium doped picene investigated by electron energy-loss spectroscopy

Cited by in corpus (9)

• Investigation on synthesis and physical properties of metal doped picene solids
• Absence of metallicity in K-doped picene: Importance of electronic correlations
• Crystal structure search and electronic properties of alkali doped phenanthrene and picene
• Spectroscopic Evidence of Low Energy Gaps Persisting Towards 120 Kelvin in Surface-Doped p-Terphenyl Crystals
• Electron-doped organics: Charge-disproportionate insulators and Hubbard-Fröhlich metals
• Evidence for phase formation in potassium intercalated 1,2;8,9-dibenzopentacene
• Correlated Electronic Structures and the Phase Diagram of Hydrocarbon-based Superconductors
• Hybridized electronic states in potassium-doped picene probed by soft x-ray spectroscopies
• Electronic excitation spectrum of doped organic thin films investigated using electron energy-loss spectroscopy