Regensburg 2025 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 6: Focus Session Many-Body Phenomena in Nanomagnets: Kondo, Spinons, Spinarons and Beyond (joint session O/TT)
TT 6.7: Vortrag
Montag, 17. März 2025, 17:45–18:00, H24
Revising the Superconductivity in Iron Based Superconductors from the Perspective of Electron Phonon Coupling — •Lanlin Du1,2 and Sheng Meng1,2,3 — 1Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, China — 2School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, China — 3Songshan Lake Materials Laboratory, Dongguan, Guangdong, China
There are currently two mainstream superconducting pairing mechanisms, namely electron phonon coupling and spin fluctuation, which are believed to play a dominant role in conventional superconductors like simple metal superconductors and unconventional superconductors like Copper oxides, respectively. Iron based superconductors are believed to connect these two aspects, that is, both mechanisms are important in it. In fact, some studies have shown that electron phonon coupling is also important in cuprates, and even provide evidence for s-wave pairing symmetry in them. Therefore, it is important to consider the role of electron phonon coupling in unconventional superconductors. Here, we revise the superconductivity in Iron based superconductors using Migdal-Eliashberg formalism and electron phonon coupling strength corrected by many body method from the two perspectives of doping and pressurization. Our results are in good agreement with the experiments. Based on this, we predict a new two-dimensional high-Tc Iron based superconductor.
Keywords: iron based superconductors; electron phonon coupling; many body calculation; new two-dimensional high-Tc superconductor