In Peierls electron-phonon models, small but light bipolarons form a dilute s-wave superconductor with Tc/Ω exceeding the Migdal-Eliashberg bound, as shown by sign-problem-free QMC simulations that remain robust to Coulomb repulsion.
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Cr substitution induces hole doping and Hund's correlations in BaFe2As2, with superconductivity suppressed by local-moment competition instead of Fermi-surface evolution.
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Bipolaronic High-Temperature Superconductivity from Phonon-Modulated Hopping: A Perspective
In Peierls electron-phonon models, small but light bipolarons form a dilute s-wave superconductor with Tc/Ω exceeding the Migdal-Eliashberg bound, as shown by sign-problem-free QMC simulations that remain robust to Coulomb repulsion.
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Hole doping and electronic correlations in Cr-substituted BaFe$_{2}$As$_{2}$
Cr substitution induces hole doping and Hund's correlations in BaFe2As2, with superconductivity suppressed by local-moment competition instead of Fermi-surface evolution.