Control of Epitaxial BaFe2As2 Atomic Configurations with Substrate Surface Terminations

Kang, Jong -Hoon; Xie, Lin; Wang, Yi; Lee, Hyungwoo; Campbell, Neil; Jiang, Jianyi; Ryan, Philip J.; Keavney, David J.; Lee, Jung -Woo; Kim, Tae Heon; Pan, Xiaoqing; Chen, Long -Qing; Hellstrom, Eric E.; Rzchowski, Mark S.; Liu, Zi -Kui; Eom, Chang -Beom

doi:10.1021/acs.nanolett.8b02704

Title: Control of Epitaxial BaFe₂As₂ Atomic Configurations with Substrate Surface Terminations

Journal Article · Mon Aug 27 00:00:00 EDT 2018 · Nano Letters

DOI:https://doi.org/10.1021/acs.nanolett.8b02704· OSTI ID:1484284

Kang, Jong -Hoon ^[1]; Xie, Lin ^[2];

^[3]; Lee, Hyungwoo ^[1]; Campbell, Neil ^[1]; Jiang, Jianyi ^[4]; Ryan, Philip J. ^[5]; Keavney, David J. ^[5]; Lee, Jung -Woo ^[1]; Kim, Tae Heon ^[1]; Pan, Xiaoqing ^[6]; Chen, Long -Qing ^[3]; Hellstrom, Eric E. ^[4]; Rzchowski, Mark S. ^[1]; Liu, Zi -Kui ^[3];

^[1]

Univ. of Wisconsin, Madison, WI (United States)
Univ. of California, Irvine, CA (United States); Nanjing Univ., Jiangsu (People's Republic of China); Southern Univ. of Science and Technology, Guangdong (People's Republic of China)
The Pennsylvania State Univ., University Park, PA (United States)
Florida State Univ., Tallahassee, FL (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)
Univ. of California, Irvine, CA (United States)

Atomic layer controlled growth of epitaxial thin films of unconventional superconductors opens the opportunity to discover novel high temperature superconductors. For instance, the interfacial atomic configurations may play an important role in superconducting behavior of monolayer FeSe on SrTiO₃ and other Fe-based superconducting thin films. Here, we demonstrate a selective control of the atomic configurations in Co-doped BaFe₂As₂ epitaxial thin films and its strong influence on superconducting transition temperatures by manipulating surface termination of (001) SrTiO₃ substrates. In a combination of first-principles calculations and high-resolution scanning transmission electron microscopy imaging, we show that Co-doped BaFe₂As₂ on TiO₂-terminated SrTiO₃ is a tetragonal structure with an atomically sharp interface and with an initial Ba layer. In contrast, Co-doped BaFe₂As₂ on SrO-terminated SrTiO₃ has a monoclinic distortion and a BaFeO_3-x initial layer. Furthermore, the superconducting transition temperature of Co-doped BaFe₂As₂ ultrathin films on TiO₂-terminated SrTiO₃ is significantly higher than that on SrO-terminated SrTiO₃, which we attribute to shaper interfaces with no lattice distortions. As a result, this study allows the design of the interfacial atomic configurations and the effects of the interface on superconductivity in Fe-based superconductors.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

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

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1484284

Journal Information:: Nano Letters, Vol. 18, Issue 10; ISSN 1530-6984

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 11 works

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In-plane rotation and transition from rectification to bipolar resistive switching in ZnO/SrTiO ₃ :Nb heterojunctions by substrate pretreatment Zhang, Ying; Li, Jiachen; Yin, Yanfeng RSC Advances, Vol. 9, Issue 64 https://doi.org/10.1039/c9ra07252g	journal	January 2019

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Title: Control of Epitaxial BaFe2As2 Atomic Configurations with Substrate Surface Terminations

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Title: Control of Epitaxial BaFe₂As₂ Atomic Configurations with Substrate Surface Terminations