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Carbonaceous sulfur hydride

Carbonaceous sulfur hydride
Identifiers
Properties
CH8S
Molar mass 52.14 g·mol−1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Carbonaceous sulfur hydride (CSH) is a potential superconductor that was announced in October 2020 by the lab of Ranga Dias at the University of Rochester, in a Nature paper that was later retracted.[1] It was reported to have a superconducting transition temperature of 15 °C (59 °F) at a pressure of 267 gigapascals (GPa), which would have made it the highest-temperature superconductor discovered.[2] The paper faced criticism dut to its non-standard data analysis calling into question its conclusions,[3][4][5][6][7] and in September 2022 it was retracted by Nature.[8] In July 2023 a second paper by the authors was retracted from Physical Review Letters due to suspected data fabrication, and in September 2023 a third paper by the authors about N-doped lutetium hydride was retracted from Nature.[9]

CSH is an uncharacterized ternary polyhydride compound of carbon, sulfur and hydrogen with a chemical formula that is thought to be CH8S. Measurements under extreme pressure are difficult, and in particular the elements are too light for an X-ray determination of crystal structure (X-ray crystallography).[1]

  1. ^ a b Snider, Elliot; Dasenbrock-Gammon, Nathan; McBride, Raymond; Debessai, Mathew; Vindana, Hiranya; Vencatasamy, Kevin; Lawler, Keith V.; Salamat, Ashkan; Dias, Ranga P. (15 October 2020). "RETRACTED ARTICLE: Room-temperature superconductivity in a carbonaceous sulfur hydride". Nature. 586 (7829): 373–377. Bibcode:2020Natur.586..373S. doi:10.1038/s41586-020-2801-z. OSTI 1673473. PMID 33057222. S2CID 222823227.
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  8. ^ Castelvecchi, Davide (2022-09-27). "Stunning room-temperature-superconductor claim is retracted". Nature. doi:10.1038/d41586-022-03066-z. PMID 36171305. S2CID 252597663.
  9. ^ Dasenbrock-Gammon, Nathan; Snider, Elliot; McBride, Raymond; Pasan, Hiranya; Durkee, Dylan; Khalvashi-Sutter, Nugzari; Munasinghe, Sasanka; Dissanayake, Sachith E.; Lawler, Keith V.; Salamat, Ashkan; Dias, Ranga P. (March 2023). "RETRACTED ARTICLE: Evidence of near-ambient superconductivity in a N-doped lutetium hydride". Nature. 615 (7951): 244–250. Bibcode:2023Natur.615..244D. doi:10.1038/s41586-023-05742-0. ISSN 1476-4687. PMID 36890373.

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