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

Abstract

Perovskite RAlO3 (R = La, Nd, Sm, and Gd) films have been deposited epitaxially on (001) TiO2-terminated SrTiO3 substrates. In this paper, it is observed that the two-dimensional transport characteristics at the RAlO3/SrTiO3 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 SmAlO3/SrTiO3 and GdAlO3/SrTiO3 interfaces are much less than those across LaAlO3/SrTiO3 and NdAlO3/SrTiO3 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 SmAlO3/SrTiO3 and GdAlO3/SrTiO3 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:
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
OSTI Identifier:
1341674
Alternate Identifier(s):
OSTI ID: 1338091
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
Resource 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)
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

Citation Formats

Li, Chen, Shen, Xuan, Yang, Yurong, Bai, Yuhang, Yuan, Zhoushen, Su, Dong, Li, Aidong, Zhang, Shantao, Wang, Peng, Bellaiche, Laurent, and Wu, Di. Chemical strain-dependent two-dimensional transport at RAlO3/SrTiO3 interfaces (R=La,Nd,Sm,and Gd). United States: N. p., 2016. Web. doi:10.1103/PhysRevB.94.241116.
Li, Chen, Shen, Xuan, Yang, Yurong, Bai, Yuhang, Yuan, Zhoushen, Su, Dong, Li, Aidong, Zhang, Shantao, Wang, Peng, Bellaiche, Laurent, & Wu, Di. Chemical strain-dependent two-dimensional transport at RAlO3/SrTiO3 interfaces (R=La,Nd,Sm,and Gd). United States. doi:10.1103/PhysRevB.94.241116.
Li, Chen, Shen, Xuan, Yang, Yurong, Bai, Yuhang, Yuan, Zhoushen, Su, Dong, Li, Aidong, Zhang, Shantao, Wang, Peng, Bellaiche, Laurent, and Wu, Di. Tue . "Chemical strain-dependent two-dimensional transport at RAlO3/SrTiO3 interfaces (R=La,Nd,Sm,and Gd)". United States. doi:10.1103/PhysRevB.94.241116. https://www.osti.gov/servlets/purl/1341674.
@article{osti_1341674,
title = {Chemical strain-dependent two-dimensional transport at RAlO3/SrTiO3 interfaces (R=La,Nd,Sm,and Gd)},
author = {Li, Chen and Shen, Xuan and Yang, Yurong and Bai, Yuhang and Yuan, Zhoushen and Su, Dong and Li, Aidong and Zhang, Shantao and Wang, Peng and Bellaiche, Laurent and Wu, Di},
abstractNote = {Perovskite RAlO3 (R = La, Nd, Sm, and Gd) films have been deposited epitaxially on (001) TiO2-terminated SrTiO3 substrates. In this paper, it is observed that the two-dimensional transport characteristics at the RAlO3/SrTiO3 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 SmAlO3/SrTiO3 and GdAlO3/SrTiO3 interfaces are much less than those across LaAlO3/SrTiO3 and NdAlO3/SrTiO3 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 SmAlO3/SrTiO3 and GdAlO3/SrTiO3 systems (which experience the largest tensile epitaxial strain), hence reducing the amount of electrons transferred.},
doi = {10.1103/PhysRevB.94.241116},
journal = {Physical Review B},
number = 24,
volume = 94,
place = {United States},
year = {2016},
month = {12}
}

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