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Title: Alleviating polarity-conflict at the heterointerfaces of KTaO{sub 3}/GdScO{sub 3} polar complex-oxides

We have synthesized and investigated the heterointerfaces of KTaO{sub 3} (KTO) and GdScO{sub 3} (GSO), which are both polar complex-oxides along the pseudo-cubic [001] direction. Since their layers have the same, conflicting net charges at interfaces, i.e., KO(−1)/ScO{sub 2}(−1) or TaO{sub 2}(+1)/GdO(+1), forming the heterointerface of KTO/GSO should be forbidden due to strong Coulomb repulsion, the so-called polarity conflict. However, we have discovered that atomic reconstruction occurs at the heterointerfaces between KTO thin-films and GSO substrates, which effectively alleviates the polarity conflict without destroying the hetero-epitaxy. Our result demonstrates one of the important ways to create artificial heterostructures from polar complex-oxides.
Authors:
; ; ;  [1] ; ;  [2]
  1. Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506 (United States)
  2. Materials Department, University of California, Santa Barbara, California 93106 (United States)
Publication Date:
OSTI Identifier:
22310838
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 10; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; COULOMB FIELD; EPITAXY; GADOLINIUM COMPOUNDS; GADOLINIUM OXIDES; INTERFACES; LAYERS; OXYGEN COMPOUNDS; POTASSIUM COMPOUNDS; SCANDIUM COMPOUNDS; SUBSTRATES; TANTALATES; THIN FILMS