Matter and Radiation at Extremes, Volume. 7, Issue 5, 058401(2022)
Clear evidence against superconductivity in hydrides under high pressure
Fig. 1. Left panel: Magnetization of sulfur hydride vs temperature reported in Ref.
Fig. 2. Lower critical field vs temperature for a standard superconductor according to Ginzburg–Landau theory. The zero-temperature critical field is 0.82 T. The numerical values of the field given in mT indicate the applied field
Fig. 3. Magnetic moment vs temperature inferred from the experimental results of Ref.
Fig. 4. Top and bottom panels: Middle left and lower left panels, respectively, of Fig. S1 of Ref.
Fig. 5. Magnetic moment vs temperature for sulfur hydride under field-cooled (red points) and zero-field-cooled (black points) conditions for three different runs performed in 2015, reported in Ref.
Fig. 6. Upper panel: Alleged signature of the Meissner effect upon field cooling indicated by the blue line, from Fig. 5(h) of Ref.
Fig. 7. The first two rows show the expected behavior of standard superconductors. The first row shows complete flux expulsion, as occurs in clean type I superconductors or type II superconductors with weak pinning centers. The second row shows small or zero Meissner fraction, as occurs in superconductors with many defects/strong pinning centers that trap magnetic field. When the external field is removed, the trapped field remains. Of course, behavior intermediate between those shown in the first and second rows is possible and in fact is most common, namely, some of the flux is expelled and some is trapped when the external field is removed. The third row shows the behavior of normal metals and of hydride superconductors (as far as we know to date): they neither expel magnetic field nor trap it.
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J. E. Hirsch, F. Marsiglio. Clear evidence against superconductivity in hydrides under high pressure[J]. Matter and Radiation at Extremes, 2022, 7(5): 058401
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Received: Mar. 15, 2022
Accepted: Jun. 21, 2022
Published Online: Oct. 8, 2022
The Author Email: Hirsch J. E. (jhirsch@ucsd.edu)