Back to Search
Start Over
Visualizing molecular orientational ordering and electronic structure in CsnC60 fulleride films
- Source :
- Phys. Rev. B 101, 085413 (2020)
- Publication Year :
- 2019
-
Abstract
- Alkali-doped fullerides exhibit a wealth of unusual phases that remain controversial by nature. Here we report a cryogenic scanning tunneling microscopy study of the sub-molecular structural and electronic properties of expanded fullerene C60 films with various cesium (Cs) doping. By varying the discrete charge states and film thicknesses, we reveal a large tunability of orientational ordering of C60 anions, yet the tunneling conductance spectra are all robustly characteristic of energy gaps, hallmarks of Jahn-Teller instability and electronic correlations. The Fermi level lies halfway within the insulating gap for stoichiometric Cs doping level of n = 1, 2, 3 and 4, apart from which it moves toward band edges with concomitant electronic states within the energy gap. Our findings establish the universality of Jahn-Teller instability, and clarify the relationship among the doping, structural and electronic structures in CsnC60 fullerides.<br />Comment: 9 pages, 6 figures
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. B 101, 085413 (2020)
- Publication Type :
- Report
- Accession number :
- edsarx.1911.08677
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevB.101.085413