Negligible Sr segregation on SrTiO3(001)-(√13 × √13)- R 33.7°reconstructed surfaces

Takeo Ohsawa; Ryota Shimizu; Katsuya Iwaya; Susumu Shiraki; Taro Hitosugi

doi:10.1063/1.4947441

Negligible Sr segregation on SrTiO₃(001)-(√13 × √13)- R 33.7°reconstructed surfaces

Takeo Ohsawa, Ryota Shimizu, Katsuya Iwaya, Susumu Shiraki, Taro Hitosugi

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

We compare the extent of Sr segregation on buffered-HF (BHF)-etched and (√13× √13)-R33.7°reconstructed SrTiO₃(001) surfaces, and reveal that Sr segregation is suppressed on the reconstructed surface. Scanning tunneling microscopy and photoemission studies of both surfaces show distinct differences in terms of atomic arrangements, electronic structures, and chemical states. The emission-angle-dependent Sr 3d core-level spectra indicate that the amount of Sr is low at the surface of the reconstructed surfaces, while the amount increases near the surface of the BHF-etched surface. Our investigations would facilitate the preparation of a compositionally well-defined SrTiO₃ surface that is of significant importance to accelerate oxide electronics research.

Original language	English
Article number	161603
Journal	Applied Physics Letters
Volume	108
Issue number	16
DOIs	https://doi.org/10.1063/1.4947441
Publication status	Published - 2016 Apr 18

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1063/1.4947441

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abstract = "We compare the extent of Sr segregation on buffered-HF (BHF)-etched and (√13× √13)-R33.7°reconstructed SrTiO3(001) surfaces, and reveal that Sr segregation is suppressed on the reconstructed surface. Scanning tunneling microscopy and photoemission studies of both surfaces show distinct differences in terms of atomic arrangements, electronic structures, and chemical states. The emission-angle-dependent Sr 3d core-level spectra indicate that the amount of Sr is low at the surface of the reconstructed surfaces, while the amount increases near the surface of the BHF-etched surface. Our investigations would facilitate the preparation of a compositionally well-defined SrTiO3 surface that is of significant importance to accelerate oxide electronics research.",

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AU - Ohsawa, Takeo

AU - Shimizu, Ryota

AU - Iwaya, Katsuya

AU - Shiraki, Susumu

AU - Hitosugi, Taro

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AB - We compare the extent of Sr segregation on buffered-HF (BHF)-etched and (√13× √13)-R33.7°reconstructed SrTiO3(001) surfaces, and reveal that Sr segregation is suppressed on the reconstructed surface. Scanning tunneling microscopy and photoemission studies of both surfaces show distinct differences in terms of atomic arrangements, electronic structures, and chemical states. The emission-angle-dependent Sr 3d core-level spectra indicate that the amount of Sr is low at the surface of the reconstructed surfaces, while the amount increases near the surface of the BHF-etched surface. Our investigations would facilitate the preparation of a compositionally well-defined SrTiO3 surface that is of significant importance to accelerate oxide electronics research.

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