Experimental realization of atomically flat and AlO2-terminated LaAlO3(001) substrate surfaces

Cited 0 time in webofscience Cited 0 time in scopus
7 Viewed 11 Downloaded
Title
Experimental realization of atomically flat and AlO2-terminated LaAlO3(001) substrate surfaces
Author(s)
Jeong Rae Kim; Lee Jiyeon N.; Junsik Mun; Yoonkoo Kim; Yeong Jae Shin; Bongju Kim; Saikat Das; Lingfei Wang; Miyoung Kim; Lippmaa Mikki; Kim Tae Heon; Tae Won Noh
Publication Date
2019-02
Journal
Physical Review Materials, v.3, no.2, pp.023801 -
Publisher
AMER PHYSICAL SOC
Abstract
Oxide single-crystal substrates with atomically smooth and chemically uniform surfaces are indispensable for constructing sharp epitaxial heterointerfaces and investigating emergent interfacial physical phenomena. Here, we report a simple method to realize atomically flat and AlO2-terminated LaAlO3 (001) [LAO(001)] substrate surfaces. So far, the LAO(001) substrate has been utilized as a structural template for the epitaxial growth of a variety of oxide films. However, well-established methods for achieving atomically flat, singly terminated LAO(001) surfaces have rarely been reported. This is mainly due to the unstable charged surfaces of LaO+ or AlO2-, which hinders simultaneous stabilizations of atomic-scale smoothness and single termination. To overcome this problem, we combined thermal annealing and subsequent deionized water leaching to treat the LAO(001) surface. We used atomic force microscopy to investigate the evolution of the LAO(001) surface during the water leaching and confirmed the atomically flat surface of the 120-min-water-leached sample. We further demonstrated the uniform AlO2 termination of the LAO(001) surface via coaxial impact-collision ion scattering spectroscopy. Using the treated substrates, we are able to grow perovskite oxide films (i.e., SrRuO3) on the LAO(001) substrate with atomically sharp heterointerfaces. Our paper provides an effective means for controlling the surface and interface of transition-metal oxide heterostructures at the atomic scale. © 2019 American Physical Society
URI
https://pr.ibs.re.kr/handle/8788114/5689
ISSN
2475-9953
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
Files in This Item:
Experimental realization of atomically flat and Al O2 -terminated LaAl O3 (001) substrate surfaces.pdfDownload

qrcode

  • facebook

    twitter

  • Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.
해당 아이템을 이메일로 공유하기 원하시면 인증을 거치시기 바랍니다.

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

Browse