The dominance of non-electron-phonon charge carrier interaction in highly-compressed superhydrides

Abstract

The primary mechanism governing the emergence of near-room-temperature superconductivity in superhydrides is widely accepted to be the electron-phonon interaction. If so, the temperature dependent resistance, R(T), in these materials should obey the Bloch-Grüneisen equation, where the power-law exponent, p, should be equal to the exact integer value of p=5. On the other hand, there is a well-established theoretical result that pure electron-magnon interaction should be manifested by p=3, and p=2 is the value for pure electron-electron interaction. Here we aimed to reveal the type of charge carrier interaction in the layered transition metal dichalcogenides PdTe2, high-entropy alloy (ScZrNb)0.65[RhPd]0.35, and highly-compressed elemental boron and superhydrides H3S, LaHx, PrH9 and BaH12 by fitting the temperature dependent resistance of these materials to the Bloch-Grüneisen equation where the power-law exponent, p, is a free-fitting parameter. In the result, we showed that the high-entropy alloy (ScZrNb)0.65[RhPd]0.35 exhibited pure electron-phonon mediated superconductivity with p = 4.9. Unexpectedly we revealed that all studied superhydrides exhibit 1.8 < p < 3.2. This implies that it is unlikely that the electron-phonon interaction is the primary mechanism for the Cooper pairs formation in highly-compressed superhydrides and alternative pairing mechanisms, for instance, the electron-magnon, the electron-polaron, the electron-electron or other, should be considered as the origin for the emergence of near-room-temperature superconductivity in these compounds.

arXiv comment36 pages, 14 figures

References in corpus (30)

• Conventional superconductivity at 203 K at high pressures
• Superconductivity at 250 K in lanthanum hydride under high pressures
• Evidence for superconductivity above 260 K in lanthanum superhydride at megabar pressures
• Ionic high-pressure form of elemental boron
• The metallization and superconductivity of dense hydrogen sulfide
• Hydrogen sulphide at high pressure: a strongly-anharmonic phonon-mediated superconductor
• Phonon scattering dominated electron transport in twisted bilayer graphene
• Pressure-induced decomposition of solid hydrogen sulfide
• What can gauge-gravity duality teach us about condensed matter physics?
• High-Temperature Superconductivity in Alkaline and Rare Earth Polyhydrides at High Pressure: A Theoretical Perspective
• High Pressure and Road to Room Temperature Superconductivity
• Bose-Einstein to BCS Crossover Picture for High-T_c Cuprates
• Superconducting Praseodymium Superhydrides
• Spectroscopy of H${}_3$S: evidence of a new energy scale for superconductivity
• High-Pressure Synthesis of Barium Superhydrides: Pseudocubic BaH12
• Superconducting Phase-Diagram of H3S under High Magnetic Fields
• Hydrogen sulfide at high pressure: change in stoichiometry
• Quantitative analysis of nonadiabatic effects in dense H${}_3$S and PH${}_3$ superconductors
• Superconductivity of epsilon-Fe: complete resistive transition
• Superconductivity emerging from a stripe charge order in IrTe2 nanoflakes
• Classifying superconductivity in compressed H3S
• Pressure-induced Superconductivity in Tin Sulfide
• Physical properties and electronic structure of Sr${}_2$Cr${}_3$As${}_2$O${}_2$ containing CrO${}_2$ and Cr${}_2$As${}_2$ square-planar lattices
• Enhanced $T_c$ and multiband superconductivity in the fully-gapped ReBe${}_{22}$ superconductor
• Classifying hydrogen-rich superconductors
• Resistive transition of hydrogen-rich superconductors
• Dynamic Superconductivity Responses in Photo-excited Optical Conductivity and Nernst Effect
• Quantifying the charge carrier interaction in metallic twisted graphene superlattices
• Anomalous charge transport of superconducting Cu${}_x$PdTe${}_2$ under high pressure
• Comparison of highly-compressed C2/m-SnH12 superhydride with conventional superconductors

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