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While the maximum critical temperature for superconductivity in pressurized sulfur hydrides appears in the range K at the top of a superconducting dome in the versus pressure P curves, standard superconductivity theories do not predict the superconducting domes. Filling this gap, we provide a first principles quantum calculation of the superconducting dome reaching room temperature for multigap superconductivity driven by the Fano-Feshbach resonance due by configuration interaction between open and closed pairing channels, i.e., between multiple gaps, in the BCS regime, resonating with a gap in the BCS-BEC crossover regime. The gap in the BCS-BEC crossover occurs tuning the chemical potential by pressure at a Lifshitz electronic topological transition from an open Fermi surface to a closed disappearing Fermi surface characterized by an asymmetric van Hove singularity. We propose that this phase in sulfur hydride is determined by its nanoscale lattice heterogeneity at atomic level forming a superlattice of quantum wires made of weakly interacting hydrogen chains in the [101] plane of the Im3m structure, called superstripes landscape. Here we show that the experimental shape of the dome in the (P) curves depends on the finite inter-wires coupling, on the increasing electron-phonon coupling g and the related phonon energy softening in the disappearing nth Fermi surface, which were not included in previous theoretical works. The results provide a first principles calculation of the room temperature multigap superconductivity dome which will be of help for material design of novel room temperature …
Publication date: 
28 Jun 2021

Maria Vittoria Mazziotti, Roberto Raimondi, Antonio Valletta, Gaetano Campi, Antonio Bianconi

Biblio References: 
arXiv preprint arXiv:2106.14394