MPSD Seminar

15241 1536680558

Ultrafast quasiparticle dynamics and electronphononcoupling in single-layer FeSe/SrTiO3 and(Li0.84Fe0.16)OHFe0.98Se

  • Datum: 13.09.2018
  • Uhrzeit: 15:00 - 16:00
  • Vortragender: Jimin Zhao
  • Institute of Physics, Chinese Academy of Sciences, Beijing, China
  • Ort: CFEL (Bldg. 99)
  • Raum: Seminar Room V, O1.109
  • Gastgeber: Andrea Cavalleri
Distinctive superconducting behaviors between bulk and monolayer FeSe make it challenging to obtain a unified picture of all FeSe-based superconductors. Here, we investigate the ultrafast quasiparticle dynamics of an intercalated superconductor (Li1-xFex)OHFe1-ySe, which is a bulk crystal but shares a similar electronic structure with single-layer FeSe on SrTiO3. We obtain the electronphonon coupling (EPC) constant λ (0.24 ± 0.03), which well bridges that of bulk FeSe crystal and single-layer FeSe/SrTiO3 [1]. Moreover, we find that such a positive correlation between λ and superconducting Tc holds among all knownFeSe-based superconductors, even in line with reported FeAs-based superconductors. Our observation indicates possible universal role of EPC in the superconductivity of all known categories of iron-based superconductors, which is a critical step towards achieving a unified superconducting mechanism for all iron-based superconductors.References:[1] Y. C. Tian, W. H. Zhang, F. S. Li, Y. L. Wu, Q. Wu, F. Sun, G. Y. Zhou, L. L. Wang, X. C. Ma, Q. K. Xue, Jimin Zhao, Ultrafast dynamics evidence of high temperature superconductivity in single unit cell FeSe on SrTiO3. PRL 116, 107001 (2016).
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