Preprint Article Version 2 Preserved in Portico This version is not peer-reviewed

Analysis Of Ac Magnetic Susceptibility Data Of A Room Temperature Superconductor

Version 1 : Received: 1 February 2022 / Approved: 1 February 2022 / Online: 1 February 2022 (11:59:19 CET)
Version 2 : Received: 3 February 2022 / Approved: 4 February 2022 / Online: 4 February 2022 (10:31:10 CET)

How to cite: Hirsch, J.E. Analysis Of Ac Magnetic Susceptibility Data Of A Room Temperature Superconductor. Preprints 2022, 2022020005 (doi: 10.20944/preprints202202.0005.v2). Hirsch, J.E. Analysis Of Ac Magnetic Susceptibility Data Of A Room Temperature Superconductor. Preprints 2022, 2022020005 (doi: 10.20944/preprints202202.0005.v2).

Abstract

In Ref. [1] Snider et al reported room temperature superconductivity in carbonaceous sulfur hydride (CSH) under high pressure. Recently the data for the temperature dependent ac magnetic susceptibility shown in figures of Ref [1] have appeared in the form of tables corresponding to different pressures [2]. Here we provide an analysis of the data for a pressure of 160 GPa. This work was performed in collaboration with D. van der Marel.

Supplementary and Associated Material

http://dirkvandermarel.ch/wp-content/uploads/chi.xlsx: excel tables for the analysis of Fig. 1
http://dirkvandermarel.ch/wp- content/uploads/derivchi.xlsx: excel tables for the analysis of Fig. 5

Keywords

hydride superconductor; room temperature superconductor; pressure; ac magnetic susceptibility; raw data; background signal

Subject

PHYSICAL SCIENCES, Condensed Matter Physics

Comments (2)

Comment 1
Received: 4 February 2022
Commenter: Jorge Hirsch
Commenter's Conflict of Interests: Author
Comment: The previously unresolved longest segment of the unwrapped curve (discussed in section V) is now shown to be composed of third order polynomials, just like all the other segments.
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Comment 2
Received: 7 February 2022
The commenter has declared there is no conflict of interests.
Comment: With user defined background (UDB, https://arxiv.org/abs/2201.11883) Dias et al. could get the result that they needed. Authors of Nature 586, 373(2020) were obliged to measure and subtract the real background, but they did not do it. It is not clear why this whole procedure with UDB-1,2,3 became known only now, 1.5 years after the publication. The authors (https://arxiv.org/abs/2201.11883) indicate that they have a new sample with Tc = 235 K, but do not provide any information about it. Many questions remain unanswered.
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