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- W3099025734 abstract "Upon thermal annealing at or above room temperature (RT) and high pressure $it P$ $sim$ 155 GPa, H$_3$S exhibits superconductivity at $it T_C$ $sim$ 200 K. Various theoretical frameworks with strong electron-phonon coupling and Coulomb repulsion have reproduced this record-level $it T_C$. Of particular relevance is that observed H-D isotopic correlations among $it T_C$, $it P$, and annealed order indicate limitations on the H-D isotope effect, leaving open for consideration unconventional high-$it T_C$ superconductivity with electronic-based enhancements. The present work examines Coulombic pairing arising from interactions between neighboring S and H species on separate interlaced sublattices constituting H$_3$S in the Im$overline{3}$m structure. The optimal transition temperature is calculated from $it{T}$$_{C0}$ = $it{k}$$_B$$^{-1}$$Lambda$$it{e}$$^2$/$ell$$zeta$, with $Lambda$ = 0.007465 $AA$, inter-sublattice S-H separation spacing $zeta$ = $it{a}$$_0$/$sqrt{2}$, interaction charge linear spacing $ell$ = $it{a}$$_0$(3/$sigma$)$^{1/2}$, average participating charge fraction $sigma$ = 3.43 $pm$ 0.10 estimated from theory, and lattice parameter $it{a}$$_0$ = 3.0823 AA. The result $it{T}$$_{C0}$ = 198.5 $pm$ 3.0 K is in excellent agreement with transition temperatures determined from resistivity and susceptibility data. Analysis of mid-infrared reflectivity confirms correlation between boson energy and $zeta$$^{-1}$. Suppression of $it T_C$ with increasing residual resistance for $<$ RT annealing is treated by scattering-induced pair breaking. Correspondence with layered high-$it T_C$ superconductor structures are discussed. A model considering Compton scattering of virtual photons of energies $leq$ $it e$$^2$/$zeta$ by inter-sublattice electrons is introduced, illustrating $Lambda$ is proportional to the reduced electron Compton wavelength." @default.
- W3099025734 created "2020-11-23" @default.
- W3099025734 creator A5003985830 @default.
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- W3099025734 date "2017-10-13" @default.
- W3099025734 modified "2023-10-05" @default.
- W3099025734 title "Compressed H<sub>3</sub>S: inter-sublattice Coulomb coupling in a high-<i>T</i><sub>C</sub>superconductor" @default.
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- W3099025734 doi "https://doi.org/10.1088/1361-648x/aa80d0" @default.
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