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

Ashkan Salamat; Dean Smith; Elliot Snider; Elyse Jones; G. Alexander Smith; Ines E. Collings; Jesse Smith; Keith V. Lawler; Melanie White; Paul Ellison

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

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arxiv 2111.15051 v1 pith:354I254M submitted 2021-11-30 cond-mat.supr-con

G. Alexander Smith , Ines E. Collings , Elliot Snider , Dean Smith , Sylvain Petitgirard , Jesse Smith , Melanie White , Elyse Jones

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Paul Ellison Keith V. Lawler Ranga P. Dias Ashkan Salamat

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classification cond-mat.supr-con

keywords c-s-hcarbonaceoushydridembarmetastablephoto-inducedstatessulfur

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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.

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