Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 70: Superconductivity: Fe-based Superconductors - Theory
TT 70.9: Vortrag
Donnerstag, 23. März 2017, 17:30–17:45, HSZ 103
Enhancement of superconductivity by interfacial phonons in perovskite-clad FeAs monolayers — Seokhwan Choi1, Won-Jun Jang1, Hyun-Jung Lee2, Jong Mok Ok2, Hyun Woo Choi1, Alex Taekyung Lee3, •Alireza Akbari2,4, Ken Nakatsukasa5, Yannis K. Semertzidis6, Yunkyu Bang7, Steven Johnston5, Jun Sung Kim2, and Jhinhwan Lee1 — 1Korea Advanced Institute of Science and Technology, Daejeon, Korea — 2Asia Pacific Center for Theoretical Physics, Pohang, Korea — 3Columbia University, New York 10027, USA — 4Pohang University of Science and Technology, Pohang, Korea — 5University of Tennessee, Knoxville, Tennessee, USA — 6Institute of Basic Science, Daejeon, Korea — 7Chonnam National University, Kwangju, Korea
The physics at interfaces between monolayer iron-based superconductors (FeSC) and perovskite substrates has received considerable attention due to the unusually high Tc of 100 K found recently in monolayer FeSe on SrTiO3. We present a quasiparticle interference (QPI) study which provides a strongest-ever proof of enhancement of the Fe-based superconductivity (FeSC) by the forward-scattering interfacial phonons in the system of the perovskite-clad FeSC monolayers. Furthermore, the self-assembled heterostructure studied here shows stronger electron-phonon coupling consistent with the doubled interfaces per FeSC monolayer and has greater applicability due to its massively parallel superconducting layers compared with the monolayer counterpart.
[1] S. Choi et al., arXiv:1608.00886.