2017/04/30 by Wen Huang, Manfred Sigrist, Zheng-Yu Weng · 2 citations
Business, Management and Accounting · Materials Science · Physics and Astronomy · #Computer science #Condensed matter physics #Corporate Taxation and Avoidance #Intellectual Capital and Performance Analysis #Iron-based superconductors research #Pairing #Physics #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.97.144507
published as Phys. Rev. B 97, 144507 (2018) · 6 pages + appendices. Published version
arxiv created 2018/04/11 · openalex publication_date 2018/04/11 · arxiv updated 2018/04/12 · openalex created_date 2018/04/24 · openalex updated_date 2026/08/05
Heavily electron-doped and single-layer FeSe superconduct at much higher temperatures than bulk FeSe. There have been a number of proposals attempting to explain the origin of the enhanced transition temperature, including the proximity to magnetic, nematic, and antiferro-orbital critical points, as well as possible strong interfacial phonon coupling in the case of single-layer FeSe. In this paper, we examine the effect of the various mechanisms in an effective two-band model. Within our model, the fluctuations associated with these instabilities contribute to different parts of the effective multiband interactions. We propose to use the collective phase fluctuation between the bands--the Leggett mode--as a tool to identify the dominant effective pairing interaction in these systems. The Leggett mode can be resolved by means of optical probes such as electronic Raman scattering. We point out that the Leggett mode in these systems, if present, shall manifest in the Raman B1g channel.