Meissner effect in nonstandard superconductors

Abstract

It was recently pointed out that so-called "superhydrides", hydrogen-rich materials that appear to become superconducting at high temperatures and pressures, exhibit physical properties that are different from both conventional and unconventional standard type I and type II superconductors [1,2]. Here we consider magnetic field expulsion in the first material in this class discovered in 2015, sulfur hydride [3]. A nuclear resonant scattering experiment has been interpreted as demonstration that the Meissner effect takes place in this material [4,5]. Here we point out that the observed effect, under the assumption that the system is in thermodynamic equilibrium, implies a Meissner pressure [6] in this material that is {\it much larger} than that of standard superconductors. This suggests that hydride superconductors are qualitatively different from the known standard superconductors {\it if} they are superconductors.

6 pages, 2 figures

References in corpus (11)

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Cited by in corpus (16)

• High-temperature superconductivity in hydrides: experimental evidence and details
• Nonstandard superconductivity or no superconductivity in hydrides under high pressure
• High-temperature superconductivity in hydrides
• Absence of magnetic evidence for superconductivity in hydrides under high pressure
• Future Study of Dense Superconducting Hydrides at High Pressure
• Evidence against superconductivity in flux trapping experiments on hydrides under high pressure & On magnetic field screening and expulsion in hydride superconductors
• Faulty evidence for superconductivity in ac magnetic susceptibility of sulfur hydride under pressure
• Flux trapping in superconducting hydrides under high pressure
• Clear evidence against superconductivity in hydrides under high pressure
• Progress, problems and prospects of room-temperature superconductivity
• On the ac magnetic susceptibility of a room temperature superconductor: anatomy of a probable scientific fraud
• Broadening of In-Field Superconducting Transitions in Hydrides
• Hydrogen in superconductors
• On the analysis of the tin-inside-H3S Mössbauer experiment
• Massive electrons and unconventional room-temperature superconductivity in superhydrides
• The Isotope Effect and Critical Magnetic Fields of Superconducting YH${}_6$: A Migdal-Eliashberg Theory Approach