Coherent growth of oxide films on cleaved layered metal oxide substrate

ORAL

Abstract

Understanding interface-induced effects requires controlled epitaxial growth of thin films on atomically smooth substrate surfaces. While conventional thin film growth on commercial substrates has proven to be a successful route, the appropriate substrate choices are limited and not all of them have well-defined surfaces for the epitaxy. Here we present an alternative method of growing oxide thin films on single-crystal substrates which will greatly increase the availability of substrates for future oxide films growth. La0.67Sr0.33MnO3 thin films were deposited on a cleaved Sr2RuO4 single crystal as a prototype system. Cleaving Sr2RuO4 in ultra-high vacuum along the [001] direction exposes clean atomically flat, SrO layer terminated surface that extends up to a few micrometers. The surface of the substrate has (√2×√2)R45° reconstruction, but the film maintains (1×1) structure, as determined by the low energy electron diffraction. Atomically sharp interface was probed by scanning tunneling electron microscopy. The surface chemical composition and the film stoichiometry were confirmed by angle-dependent X-ray photoelectron spectroscopy. These systems can serve as a tool to explore proximity effects between superconductors and ferromagnets.

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Presenters

  • Prahald Siwakoti

    Department of Physics and Astronomy, Louisiana State University

Authors

  • Prahald Siwakoti

    Department of Physics and Astronomy, Louisiana State University

  • Hangwen Guo

    Louisiana State Univ - Baton Rouge, Department of Physics, Louisiana State University, Dept. of Physics and Astronomy , Louisiana State University, USA, Department of Physics & Astronomy, Louisiana State University, Louisiana State University, Department of Physics and Astronomy, Louisiana State University

  • Zhen Wang

    Department of Physcis and Astronomy, Louisiana State University, Louisiana State University, Louisiana State Univ - Baton Rouge, Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Department of Physics and Astronomy, Louisiana State University

  • Zhiqiang Mao

    Tulane University, Physics and Engineering physics department, Tulane Univ, Department of Physics and Engineering Physics, Tulane University, Tulane Univ, Department of Physics and Engineering Physics , Tulane University

  • Jiandi Zhang

    Department of Physcis and Astronomy, Louisiana State University, Louisiana State Univ - Baton Rouge, Department of Physics, Louisiana State University, Physics and Astronomy, Louisiana State University, Department of Physics and Astronomy, Louisiana State University