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03 July 2022
 
  » arxiv » 1911.8677

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Visualizing molecular orientational ordering and electronic structure in CsnC60 fulleride films
Sha Han ; Meng-Xue Guan ; Can-Li Song ; Yi-Lin Wang ; Ming-Qiang Ren ; Sheng Meng ; Xu-Cun Ma ; Qi-Kun Xue ;
Date 20 Nov 2019
AbstractAlkali-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.
Source arXiv, 1911.8677
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