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Dresden 2017 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 70: Superconductivity: Fe-based Superconductors - Theory

TT 70.9: Talk

Thursday, March 23, 2017, 17:30–17:45, HSZ 103

Enhancement of superconductivity by interfacial phonons in perovskite-clad FeAs monolayersSeokhwan 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 Lee11Korea 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.

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