Abstract

The dominant mechanism of high-transition-temperature $({T}_{\text{c}})$ superconductivity in cuprates remains an agonizing puzzle in condensed matter physics. The more recent discoveries of FeSe-based superconductors provide ideal new platforms to explore the high-${T}_{\text{c}}$ superconducting mechanism. Here we develop a generic mechanism of superconductivity centered at the commonality shared by many high-${T}_{\text{c}}$ materials, namely, their effective carrier densities are universally low, and are therefore necessarily accompanied by low energy plasmons. We first show that the excitations of such plasmons can largely suppress the Coulomb repulsion of the electrons. Furthermore, the electron-phonon and electron-plasmon couplings can inherently join force in mediating electron pairing, and when applied to the monolayered FeSe on ${\mathrm{SrTiO}}_{3}$, the plasmon-enhanced ${T}_{\text{c}}$ is one order of magnitude higher than that due to phonon alone, to the experimentally observed range. The present ``phonon $+$ plasmon'' mechanism also embodies characteristic dependences of ${T}_{\text{c}}$ on the carrier density and isotope substitution, and may find broad applicability in many superconducting systems with low carrier densities, including, most notably, the cuprates.

Full Text
Paper version not known

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call

Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.