Investigation of electric field-induced structural changes at fe-doped SrTiO3 anode interfaces by second harmonic generation

David Ascienzo; Haochen Yuan; Steve Greenbaum; Thorsten J.M. Bayer; Russell A. Maier; Jian Jun Wang; Clive A. Randall; Elizabeth C. Dickey; Haibin Zhao; Yuhang Ren

doi:10.3390/ma9110883

Investigation of electric field-induced structural changes at fe-doped SrTiO₃ anode interfaces by second harmonic generation

David Ascienzo, Haochen Yuan, Steve Greenbaum, Thorsten J.M. Bayer, Russell A. Maier, Jian Jun Wang, Clive A. Randall, Elizabeth C. Dickey, Haibin Zhao, Yuhang Ren

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Abstract

We report on the detection of electric field-induced second harmonic generation (EFISHG) from the anode interfaces of reduced and oxidized Fe-doped SrTiO₃ (Fe:STO) single crystals. For the reduced crystal, we observe steady enhancements of the susceptibility components as the imposed dc-voltage increases. The enhancements are attributed to a field-stabilized electrostriction, leading to Fe:Ti-O bond stretching and bending in Fe:Ti-O₆ octahedra. For the oxidized crystal, no obvious structural changes are observed below 16 kV/cm. Above 16 kV/cm, a sharp enhancement of the susceptibilities occurs due to local electrostrictive deformations in response to oxygen vacancy migrations away from the anode. Differences between the reduced and oxidized crystals are explained by their relative oxygen vacancy and free carrier concentrations which alter internal electric fields present at the Pt/Fe:STO interfaces. Our results show that the optical SHG technique is a powerful tool for detecting structural changes near perovskite-based oxide interfaces due to field-driven oxygen vacancy migration.

Original language	English (US)
Article number	883
Journal	Materials
Volume	9
Issue number	11
DOIs	https://doi.org/10.3390/ma9110883
State	Published - Nov 2016

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Materials Science(all)

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@article{2bb2d6ddd1c7434e9665242986a2fe97,

title = "Investigation of electric field-induced structural changes at fe-doped SrTiO3 anode interfaces by second harmonic generation",

abstract = "We report on the detection of electric field-induced second harmonic generation (EFISHG) from the anode interfaces of reduced and oxidized Fe-doped SrTiO3 (Fe:STO) single crystals. For the reduced crystal, we observe steady enhancements of the susceptibility components as the imposed dc-voltage increases. The enhancements are attributed to a field-stabilized electrostriction, leading to Fe:Ti-O bond stretching and bending in Fe:Ti-O6 octahedra. For the oxidized crystal, no obvious structural changes are observed below 16 kV/cm. Above 16 kV/cm, a sharp enhancement of the susceptibilities occurs due to local electrostrictive deformations in response to oxygen vacancy migrations away from the anode. Differences between the reduced and oxidized crystals are explained by their relative oxygen vacancy and free carrier concentrations which alter internal electric fields present at the Pt/Fe:STO interfaces. Our results show that the optical SHG technique is a powerful tool for detecting structural changes near perovskite-based oxide interfaces due to field-driven oxygen vacancy migration.",

author = "David Ascienzo and Haochen Yuan and Steve Greenbaum and Bayer, {Thorsten J.M.} and Maier, {Russell A.} and Wang, {Jian Jun} and Randall, {Clive A.} and Dickey, {Elizabeth C.} and Haibin Zhao and Yuhang Ren",

note = "Funding Information: Research at Hunter was supported by an AFOSR (Grant No. FA9550-14-1-0179), a PSC-CUNY grant (CUNY-RF#66501-00-45) and a NYSTAR through the Photonics Center for Applied Technology at the City University of New York (CUNY-RF#55418-11-07).",

year = "2016",

month = nov,

doi = "10.3390/ma9110883",

language = "English (US)",

volume = "9",

journal = "Materials",

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T1 - Investigation of electric field-induced structural changes at fe-doped SrTiO3 anode interfaces by second harmonic generation

AU - Ascienzo, David

AU - Yuan, Haochen

AU - Greenbaum, Steve

AU - Bayer, Thorsten J.M.

AU - Maier, Russell A.

AU - Wang, Jian Jun

AU - Randall, Clive A.

AU - Dickey, Elizabeth C.

AU - Zhao, Haibin

AU - Ren, Yuhang

N1 - Funding Information: Research at Hunter was supported by an AFOSR (Grant No. FA9550-14-1-0179), a PSC-CUNY grant (CUNY-RF#66501-00-45) and a NYSTAR through the Photonics Center for Applied Technology at the City University of New York (CUNY-RF#55418-11-07).

PY - 2016/11

Y1 - 2016/11

N2 - We report on the detection of electric field-induced second harmonic generation (EFISHG) from the anode interfaces of reduced and oxidized Fe-doped SrTiO3 (Fe:STO) single crystals. For the reduced crystal, we observe steady enhancements of the susceptibility components as the imposed dc-voltage increases. The enhancements are attributed to a field-stabilized electrostriction, leading to Fe:Ti-O bond stretching and bending in Fe:Ti-O6 octahedra. For the oxidized crystal, no obvious structural changes are observed below 16 kV/cm. Above 16 kV/cm, a sharp enhancement of the susceptibilities occurs due to local electrostrictive deformations in response to oxygen vacancy migrations away from the anode. Differences between the reduced and oxidized crystals are explained by their relative oxygen vacancy and free carrier concentrations which alter internal electric fields present at the Pt/Fe:STO interfaces. Our results show that the optical SHG technique is a powerful tool for detecting structural changes near perovskite-based oxide interfaces due to field-driven oxygen vacancy migration.

AB - We report on the detection of electric field-induced second harmonic generation (EFISHG) from the anode interfaces of reduced and oxidized Fe-doped SrTiO3 (Fe:STO) single crystals. For the reduced crystal, we observe steady enhancements of the susceptibility components as the imposed dc-voltage increases. The enhancements are attributed to a field-stabilized electrostriction, leading to Fe:Ti-O bond stretching and bending in Fe:Ti-O6 octahedra. For the oxidized crystal, no obvious structural changes are observed below 16 kV/cm. Above 16 kV/cm, a sharp enhancement of the susceptibilities occurs due to local electrostrictive deformations in response to oxygen vacancy migrations away from the anode. Differences between the reduced and oxidized crystals are explained by their relative oxygen vacancy and free carrier concentrations which alter internal electric fields present at the Pt/Fe:STO interfaces. Our results show that the optical SHG technique is a powerful tool for detecting structural changes near perovskite-based oxide interfaces due to field-driven oxygen vacancy migration.

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Investigation of electric field-induced structural changes at fe-doped SrTiO₃ anode interfaces by second harmonic generation

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