Correlation of Fe-Based Superconductivity and Electron-Phonon Coupling in an FeAs/Oxide Heterostructure

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Title
Correlation of Fe-Based Superconductivity and Electron-Phonon Coupling in an FeAs/Oxide Heterostructure
Author(s)
Seokhwan Choi; Steven Johnston; Wonjun Jang; Klaus Koepemik; Ken Nakatsukasa; Jong Mok Ok; Hyun-Jung Lee; Hyun Woo Choi; Alex Taekyung Lee; Alireza Akbari; Yannis K. Semertzidis; Yunkyu Bang; Jun Sung Kim; Jhinhwan Lee
Publication Date
2017-09
Journal
PHYSICAL REVIEW LETTERS, v.119, no.10, pp.107003 -
Publisher
AMER PHYSICAL SOC
Abstract
Interfacial phonons between iron-based superconductors (FeSCs) and perovskite substrates have received considerable attention due to the possibility of enhancing preexisting superconductivity. Using scanning tunneling spectroscopy, we studied the correlation between superconductivity and e−ph interaction with interfacial phonons in an iron-based superconductor Sr2VO3FeAs (Tc≈33  K) made of alternating FeSC and oxide layers. The quasiparticle interference measurement over regions with systematically different average superconducting gaps due to the e−ph coupling locally modulated by O vacancies in the VO2 layer, and supporting self-consistent momentum-dependent Eliashberg calculations provide a unique real-space evidence of the forward-scattering interfacial phonon contribution to the total superconducting pairing. © 2017 American Physical Society
URI
https://pr.ibs.re.kr/handle/8788114/3844
ISSN
0031-9007
Appears in Collections:
Center for Axion and Precision Physics Research(액시온 및 극한상호작용 연구단) > Journal Papers (저널논문)
Files in This Item:
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