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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 | | 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. | | Source: | arXiv, 1911.8677 | | Services: | Forum | Review | PDF | Favorites | |
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