Regensburg 2016 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 46: Superconductivity: Fe-based Superconductors - FeSe
TT 46.2: Vortrag
Mittwoch, 9. März 2016, 10:15–10:30, H19
High-Tc superconductivity in monolayer FeSe on SrTiO3 via interface-induced small-q electron-phonon coupling — •Alexandros Aperis and Peter M. Oppeneer — Uppsala University, Sweden
A monolayer of FeSe deposited on SrTiO3 becomes superconducting at temperatures that exceed Tc=100 K, as compared to a bulk Tc of 8 K. Recent ARPES measurements have provided strong evidence that an interfaced-induced electron-phonon interaction between FeSe electrons and SrTiO3 phonons plays a decisive role in this phenomenon. However, the mechanism that drives this tantalizing high-Tc boost is still unclear.
Here, we examine the recent experimental findings using fully anisotropic, full bandwidth multiband Eliashberg calculations focusing on the superconducting state of FeSe/STO. We use a realistic ten band tight-binding band structure for the electrons of monolayer FeSe and study how the suggested interface-induced small-q electron-phonon interaction mediates superconductivity. Our calculations produce a high-Tc s-wave superconducting state with the experimentally resolved momentum dependence. Further, we calculate the normal metal/insulator/superconductor tunneling spectrum and identify fingerprints of the interface-induced phonon mechanism.