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Title: Ultrathin epitaxial barrier layer to avoid thermally induced phase transformation in oxide heterostructures

Incorporating oxides with radically different physical and chemical properties into heterostructures offers tantalizing possibilities to derive new functions and structures. Recently, we have fabricated freestanding 2D oxide membranes using the water-soluble perovskite Sr 3Al 2O 6 as a sacrificial buffer layer. Here, with atomic-resolution spectroscopic imaging, we observe that direct growth of oxide thin films on Sr 3Al 2O 6 can cause complete phase transformation of the buffer layer, rendering it water-insoluble. More importantly, we demonstrate that an ultrathin SrTiO 3 layer can be employed as an effective barrier to preserve Sr 3Al 2O 6 during subsequent growth, thus allowing its integration in a wider range of oxide heterostructures.
ORCiD logo [1] ;  [2] ;  [3] ;  [4] ;  [1]
  1. Cornell Univ., Ithaca, NY (United States)
  2. Stanford Univ., Stanford, CA (United States)
  3. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  4. SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., Stanford, CA (United States)
Publication Date:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
ACS Applied Materials and Interfaces
Additional Journal Information:
Journal Volume: 9; Journal Issue: 1; Journal ID: ISSN 1944-8244
American Chemical Society
Research Org:
Stanford Univ., CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
36 MATERIALS SCIENCE; oxide heterostructures; soft oxides; thermal stability; STEM-EELS; buffer layers
OSTI Identifier: