Chemical strain-dependent two-dimensional transport at RAlO3/SrTiO3 interfaces (R=La,Nd,Sm,and Gd)

Li, Chen; Shen, Xuan; Yang, Yurong; Bai, Yuhang; Yuan, Zhoushen; Su, Dong; Li, Aidong; Zhang, Shantao; Wang, Peng; Bellaiche, Laurent; Wu, Di

doi:10.1103/PhysRevB.94.241116

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

Journal Article · Tue Dec 27 00:00:00 EST 2016 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.94.241116· OSTI ID:1341674

Li, Chen ^[1]; Shen, Xuan ^[1]; Yang, Yurong ^[2]; Bai, Yuhang ^[1]; Yuan, Zhoushen ^[1]; Su, Dong ^[3]; Li, Aidong ^[1]; Zhang, Shantao ^[1]; Wang, Peng ^[1]; Bellaiche, Laurent ^[2]; Wu, Di ^[1]

Nanjing Univ. (China). National Lab. of Solid State Microstructures. Dept. of Materials Science and Engineering. Collaborative Innovation Center of Advanced Microstructures
Univ. of Arkansas, Fayetteville, AR (United States). Dept. of Physics. Inst. for Nanoscience and Engineering
Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials

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.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States); Univ. of Arkansas, Fayetteville, AR (United States); Nanjing Univ. (China)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); 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

Grant/Contract Number:: SC0012704; N00014-12-1-1034; 0722625; 0959124; 0918970; 2015CB921203; 11374139; U1431112

OSTI ID:: 1341674

Alternate ID(s):: OSTI ID: 1338091

Report Number(s):: BNL-113402-2017-JA; KC0403020; TRN: US1701085

Journal Information:: Physical Review B, Vol. 94, Issue 24; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 7 works

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

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