Pairing Mechanism of the FeSe-monolayer and related Systems: Dynamical Tuning of Pairing Cutoff Energy
- Title
- Pairing Mechanism of the FeSe-monolayer and related Systems: Dynamical Tuning of Pairing Cutoff Energy
- Authors
- BANG, YUNKYU
- Date Issued
- 2018-08-21
- Publisher
- National Lab for Superconductivity, Institute of Physics, Chinese Academy of Sciences
- Abstract
- There are a group of FeSe systems: FeSe/SrTiO3 monolayer system (Tc~60-100K) and other heavily electron-doped iron selenide (HEDIS) compounds such as AxFe2-ySe2 (A=K, Rb, Cs, Tl, etc.) (Tc~30-40K), (Li1-xFexOH)FeSe (Tc~40K), etc. These systems have all very high Tc (30K -100K) despite having only the electron Fermi surfaces (FSs) but no hole FS.
Here we propose a unifying pairing mechanism [1] based on a new concept: dynamical tuning of pairing cutoff energy. With this mechanism, I show how the incipient band without a Fermi surface can participate pairing interaction through RG process and the system forms the s++-wave state only with the electron pockets. In this way, the HEDIS system can achieve the maximum Tc, stored in the system, and yet avoid the detrimental impurity pair-breaking scattering. Our theory not only provides a unifying pairing mechanism for all HEDIS system, but also naturally explains the puzzling double dome structure of the phase diagram of Tc versus tuning parameter (doping, pressure, etc) [2, 3].
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/97785
- Article Type
- Conference
- Citation
- The 12th International Conference on Materials and Mechanisms of Superconductivity and High Temperature Superconductors (M2S-2018), page. 89, 2018-08-21
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