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Recent experiments have reported the emergence of high-temperature superconductivity with critical temperature T c between 43 K and 123 K in a potassium-doped aromatic hydrocarbon para-Terphenyl or p-Terphenyl. This achievement provides the record for the highest T c in an organic superconductor overcoming the previous record of T c= 38 K in Cs 3 C 60 fulleride. Here we propose that the driving mechanism is the quantum resonance between superconducting gaps near a Lifshitz transition which belongs to the class of Fano resonances called shape resonances. For the case of p-Terphenyl our numerical solutions of the multigap equation shows that high T c is driven by tuning the chemical potential by K doping and it appears only in a narrow energy range near a Lifshitz transition. At the maximum critical temperature, T c= 123 K, the condensate in the appearing new small Fermi surface pocket is in the …
IOP Publishing
Publication date: 
12 Jul 2017

Maria Vittoria Mazziotti, Antonio Valletta, Gaetano Campi, Davide Innocenti, Andrea Perali, Antonio Bianconi

Biblio References: 
Volume: 118 Issue: 3 Pages: 37003
EPL (Europhysics Letters)