Abstract
Using a BCS-adapted equation via multivariate analysis of structural and electronic properties, we calculated the critical temperature of fullerides A2BC60 and A3C60, with pure A and B alkaline metal or solvated with NH3 and CH3NH2, in good agreement with the experimental data. In the ammoniation of Na2CsC60, concomitant expansion of the lattice and the increasing ionic character of the chemical bonds between the ligands and C60, the critical temperature rises by about 20 K. For methylamine, there is an increase in critical temperature far lower than with ammonia, indicating that anisotropic lattice expansion does not favor the phenomenon. Besides crystal lattice expansion, a known factor that influences the critical temperature, our model identifies the other structural and electronic factors that contribute to the critical temperature of these materials. In alkali metal hydration, the crystal is expanded at the same time that the HOMO-LUMO gap is reduced, favoring electron transfer between the metal–ligand complex and C60. With the intercalation of water molecules in these fullerides, we predict that Na3C60 becomes superconducting at a critical temperature of 47.2 K and that Cs3C60 reaches 50 K.
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da Silva, R.C., Bastos, C.C. & Pavão, A.C. Intercalation of small molecules in alkali metal fullerides superconductors. Theor Chem Acc 139, 79 (2020). https://doi.org/10.1007/s00214-020-02591-2
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DOI: https://doi.org/10.1007/s00214-020-02591-2