Superconductivity of doped Ar@C60

Area of Science:

• Materials Science
• Solid-State Physics
• Nanotechnology

Background:

• Endohedral fullerenes, where atoms are encapsulated within fullerene cages, are of interest for their unique electronic and structural properties.
• Superconductivity in fullerene-based materials is a complex phenomenon influenced by structure, doping, and guest atoms.

Purpose of the Study:

• To synthesize pure argon-containing fullerenes in a measurable quantity (milligram amount).
• To investigate the superconducting properties of these novel endohedral fullerene compounds.
• To assess the influence of the encapsulated argon atom on the fullerene cage and its superconductivity.

Main Methods:

• High-pressure synthesis techniques to encapsulate argon within C60 fullerene cages.
• Purification methods to obtain milligram quantities of pure argon-filled fullerenes.
• Low-temperature measurements to determine critical temperatures and characterize superconducting behavior.

Main Results:

• Successful synthesis of milligram amounts of pure argon-containing fullerenes.
• Discovery of the first endohedral superconductors based on argon-filled fullerenes.
• Observed critical temperatures were lower than theoretically predicted or observed in similar endohedral systems.

Conclusions:

• The encapsulated argon atom exerts a strong influence on the electronic structure and properties of the C60 cage.
• Argon's presence significantly affects the superconducting critical temperature, suggesting a novel mechanism of interaction.
• These findings open new avenues for designing endohedral fullerene-based superconductors with tailored properties.