Contribution of substrate phonon to the superconductivity of 1 unit-layer FeSe on SrTiO<sub>3</sub>

POSTER

Abstract

A single unit-layer (1 UL) FeSe grown on SrTiO3 is one of Fe-based superconductors and has a high superconducting transition temperature compared to bulk FeSe of which Tc is near 8K. To investigate interface effect, especially phonons of substrate, we used scanning tunneling microscope (STM) and measured local electron density of states (DOS) of 1 UL FeSe on SrTiO3. Our results show that the spectral features depend on the phonon dispersions of FeSe as well as that of SrTiO3. Phonon density of states and electron-phonon coupling constant were calculated according to Eliashberg theory.

Presenters

  • Hoyeon Jeon

    • Seoul National University, Seoul, Korea

Authors

  • Hoyeon Jeon

    • Seoul National University, Seoul, Korea

  • Minjun Lee

    • Seoul National University, Seoul, Korea

  • Jin Mo Bok

    • Sungkyunkwan University, Suwon, Korea

  • Han-Yong Choi

    • Sungkyunkwan Univ
    • Sungkyunkwan University, Suwon, Korea

  • Yunkyu Bang

    • Pohang University of Science and Technology, Pohang, Korea
    • Asia Pacific Center for Theoretical Physics and Department of Physics, POSTECH

  • Jungpil Seo

    • Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu, Korea
    • Daegu Gyeongbuk Institute of Science and Technology

  • Jungseok Chae

    • Center for Quantum Nanoscience, Institute for Basic Science (IBS), Seoul, Korea

  • Young Kuk

    • Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu, Korea