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Title: Chemical strain-dependent two-dimensional transport at R AlO 3 / SrTiO 3 interfaces ( R = La , Nd , Sm , and Gd )

Perovskite RAlO 3 (R = La, Nd, Sm, and Gd) films have been deposited epitaxially on (001) TiO 2-terminated SrTiO 3 substrates. In this paper, it is observed that the two-dimensional transport characteristics at the RAlO 3/SrTiO 3 interfaces are very sensitive to the species of rare-earth element, that is to chemical strain. Although electron energy loss spectroscopy measurements show that electron transfer occurs in all the four polar/nonpolar heterostructures, the amount of electrons transferred across SmAlO 3/SrTiO 3 and GdAlO 3/SrTiO 3 interfaces are much less than those across LaAlO 3/SrTiO 3 and NdAlO 3/SrTiO 3 interfaces. First-principles calculations reveal the competition between ionic polarization and electronic polarization in the polar layers in compensating the build-in polarization due to the polar discontinuity at the interface. Finally, in particular, a large ionic polarization is found in SmAlO 3/SrTiO 3 and GdAlO 3/SrTiO 3 systems (which experience the largest tensile epitaxial strain), hence reducing the amount of electrons transferred.
Authors:
 [1] ;  [1] ;  [2] ;  [1] ;  [1] ;  [3] ;  [1] ;  [1] ;  [1] ;  [2] ;  [1]
  1. Nanjing Univ. (China). National Lab. of Solid State Microstructures. Dept. of Materials Science and Engineering. Collaborative Innovation Center of Advanced Microstructures
  2. Univ. of Arkansas, Fayetteville, AR (United States). Dept. of Physics. Inst. for Nanoscience and Engineering
  3. Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials
Publication Date:
Report Number(s):
BNL-113402-2017-JA
Journal ID: ISSN 2469-9950; KC0403020; TRN: US1701085
Grant/Contract Number:
SC0012704; N00014-12-1-1034; 0722625; 0959124; 0918970; 2015CB921203; 11374139; U1431112
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 94; Journal Issue: 24; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Brookhaven National Lab. (BNL), Upton, NY (United States); Univ. of Arkansas, Fayetteville, AR (United States); Nanjing Univ. (China)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); US Department of the Navy, Office of Naval Research (ONR); USDOD; National Science Foundation (NSF); State Key Program for Basic Research of China; Natural Science Foundation of China
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; dimensional transport; electron energy loss spectroscopy; Perovskite; polar discontinuity; Center for Functional Nanomaterials
OSTI Identifier:
1341674
Alternate Identifier(s):
OSTI ID: 1338091