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Lower pressure phases and metastable states of superconducting photo-induced carbonaceous sulfur hydride

Authors :
Smith, G. Alexander
Collings, Ines E.
Snider, Elliot
Smith, Dean
Petitgirard, Sylvain
Smith, Jesse
White, Melanie
Jones, Elyse
Ellison, Paul
Lawler, Keith V.
Dias, Ranga P.
Salamat, Ashkan
Publication Year :
2021

Abstract

Room-temperature superconductivity was recently discovered in carbonaceous sulfur hydride (C-S-H) close to 3\,Mbar. We report significant differences in the superconducting response of C-S-H, with a maximum $T_{C}$ of 191(1)\,K, below a 1\,Mbar. Variations in intensity of the C-H Raman modes reveal carbon content can vary between crystals synthesized with the same photo-induced method. Synchrotron single crystal x-ray diffraction identifies polymorphism with increasing degrees of covalency. These unique metastable states are highly sensitive to thermodynamic pathways.

Details

Database :
arXiv
Publication Type :
Report
Accession number :
edsarx.2111.15051
Document Type :
Working Paper