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Percolating Superconductivity in Air-Stable Organic-Ion Intercalated MoS_2

机译：Percolating Superconductivity in Air-Stable Organic-Ion Intercalated MoS_2

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摘要

When doped into a certain range of charge carrier concentrations, MoS_2departs from its pristine semiconducting character to become a stronglycorrelated material characterized by exotic phenomena such as chargedensity waves or superconductivity. However, the required doping levelsare typically achieved using ionic-liquid gating or air-sensitive alkali-ionintercalation, which are not compatible with standard device fabricationprocesses. Here, the emergence of superconductivity and a charge densitywave phase in air-stable organic cation intercalated MoS_2 crystals arereported. By selecting two different molecular guests, it is shown that thesecorrelated electronic phases depend dramatically on the intercalated cation,demonstrating the potential of organic ion intercalation to finely tune theproperties of 2D materials. Moreover, it is found that a fully developed zeroresistancestate is not reached in few-nm-thick flakes, indicating the presenceof 3D superconductive paths that are severed by the mechanical exfoliation.This behavior is ascribed to an inhomogeneous charge carrier distribution,which is probed at the nanoscale using scanning near-field optical microscopy.The results establish organic-ion intercalated MoS_2 as a platform tostudy the emergence and modulation of correlated electronic phases.

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