Correlation-promoted electron-phonon coupling and superconductivity in bulk FeSe
Lan-Lin Du, Shiqi Hu, Yang Yang, Xuande Bu, Sheng Meng
DOI 10.1103/9qx8-7q4x · Physical Review Materials
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Abstract
Electron-phonon coupling (EPC) plays an important role in FeSe, yet theoretical predictions have struggled to reconcile with experiments on doping- and pressure-dependent superconductivity. Here, we employ dynamical mean-field theory to investigate correlation-corrected EPC in FeSe under carrier doping and pressure. By incorporating correlation-corrected EPC strength and applying the Migdal-Eliashberg formalism for phonon-mediated superconductivity, we predict superconducting transition temperatures Tc that closely match experiments and reproduce the observed doping- and pressure-dependent trends. We further find that the electronic correlation strength, characterized by the bandwidth near the Fermi level, shows an opposite trend to Tc, in contrast to EPC. Our work demonstrates the consistency of the correlation-promoted EPC and Tc over a range of experimental conditions, which suggests that superconductivity in FeSe may originate primarily from correlation-promoted electron-phonon coupling.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 12 | Pressure not reported | unknown |
| FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8 | Pressure not reported | unknown |
| FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 37 | 8 GPa | unknown |
| KxFe2-ySe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30 | Pressure not reported | unknown |
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