Studies on the la substitution site in Bi4-xLa xTi3O12 by polarization-dependent x-ray absorption spectroscopy

D. W. Lee; J. W. Seo; S. Cho; S. R. Park; C. Kim; B. J. Kim; S. J. Oh; B. S. Kang; T. W. Noh; B. H. Park

doi:10.1063/1.2169881

Studies on the la substitution site in Bi_4-xLa _xTi₃O₁₂ by polarization-dependent x-ray absorption spectroscopy

D. W. Lee, J. W. Seo, S. Cho, S. R. Park, C. Kim, B. J. Kim, S. J. Oh, B. S. Kang, T. W. Noh, B. H. Park

Physics

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

8 Citations (Scopus)

Abstract

We performed polarization-dependent x-ray absorption spectroscopy studies on epitaxially grown Bi_4-xLa_xTi₃O₁₂ thin films at the 3p→6s edges to find the La substitution site. Our results show a clear difference between the absorption spectra taken with parallel and perpendicular polarizations, which is consistent with the view that La replaces Bi in the layer rather than at the perovskite site. Calculated absorption spectra also support the interpretation. We therefore conclude that some, if not all, La atoms replace the Bi atoms in the layer.

Original language	English
Article number	034101
Journal	Journal of Applied Physics
Volume	99
Issue number	3
DOIs	https://doi.org/10.1063/1.2169881
Publication status	Published - 2006 Feb 1

Bibliographical note

Funding Information:
This work is supported (in part) by the Korean Science and Engineering Foundation through the Center for Strongly Correlated Materials Research. One of the authors (B.H.P.) was supported by the National Research Program for the 0.1 Terabit Non-volatile Memory Development sponsored by the Korea Ministry of Science and Technology. SSRL is operated by the DOE Office of Basic Energy Sciences, Divisions of Chemical Sciences and Materials Sciences. FIG. 1. Bi 4 Ti 3 O 12 crystal structure. One may replace Bi atoms by La to make Bi 4 − x La x Ti 3 O 12 . FIG. 2. (a) Photoexcitation of an electron from 3 p to 6 s orbitals in an isotropic environment (at the perovskite site). The 6 s orbital is symmetric due to the isotropic crystal field. (b) Excitation from 3 p to 6 s at the layer site. The 6 s orbital is deformed due to the anisotropic crystal field. FIG. 3. The La 3 p → 6 s XANES spectra for (a) small and (b) wide energy ranges. Corresponding energy window for the data in panel (a) is shown in panel (b) as a dotted rectangle. (c) Experimental configurations. The TEY was measured by taking the sample current through the LSCO layer. Definition of the polarization angle is also shown. θ = 0 ° (normal incidence) corresponds to the polarization in the a b plane. FIG. 4. La 3 p → 6 s XANES spectra calculated by FEFF 8.0 for (a) the perovskite and (b) the layer sites.

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)

Access to Document

10.1063/1.2169881

Cite this

@article{c070daeea70f42f78fc1123153f038ca,

title = "Studies on the la substitution site in Bi4-xLa xTi3O12 by polarization-dependent x-ray absorption spectroscopy",

abstract = "We performed polarization-dependent x-ray absorption spectroscopy studies on epitaxially grown Bi4-xLaxTi3O12 thin films at the 3p→6s edges to find the La substitution site. Our results show a clear difference between the absorption spectra taken with parallel and perpendicular polarizations, which is consistent with the view that La replaces Bi in the layer rather than at the perovskite site. Calculated absorption spectra also support the interpretation. We therefore conclude that some, if not all, La atoms replace the Bi atoms in the layer.",

author = "Lee, {D. W.} and Seo, {J. W.} and S. Cho and Park, {S. R.} and C. Kim and Kim, {B. J.} and Oh, {S. J.} and Kang, {B. S.} and Noh, {T. W.} and Park, {B. H.}",

note = "Funding Information: This work is supported (in part) by the Korean Science and Engineering Foundation through the Center for Strongly Correlated Materials Research. One of the authors (B.H.P.) was supported by the National Research Program for the 0.1 Terabit Non-volatile Memory Development sponsored by the Korea Ministry of Science and Technology. SSRL is operated by the DOE Office of Basic Energy Sciences, Divisions of Chemical Sciences and Materials Sciences. FIG. 1. Bi 4 Ti 3 O 12 crystal structure. One may replace Bi atoms by La to make Bi 4 − x La x Ti 3 O 12 . FIG. 2. (a) Photoexcitation of an electron from 3 p to 6 s orbitals in an isotropic environment (at the perovskite site). The 6 s orbital is symmetric due to the isotropic crystal field. (b) Excitation from 3 p to 6 s at the layer site. The 6 s orbital is deformed due to the anisotropic crystal field. FIG. 3. The La 3 p → 6 s XANES spectra for (a) small and (b) wide energy ranges. Corresponding energy window for the data in panel (a) is shown in panel (b) as a dotted rectangle. (c) Experimental configurations. The TEY was measured by taking the sample current through the LSCO layer. Definition of the polarization angle is also shown. θ = 0 ° (normal incidence) corresponds to the polarization in the a b plane. FIG. 4. La 3 p → 6 s XANES spectra calculated by FEFF 8.0 for (a) the perovskite and (b) the layer sites. ",

year = "2006",

month = feb,

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doi = "10.1063/1.2169881",

language = "English",

volume = "99",

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TY - JOUR

T1 - Studies on the la substitution site in Bi4-xLa xTi3O12 by polarization-dependent x-ray absorption spectroscopy

AU - Lee, D. W.

AU - Seo, J. W.

AU - Cho, S.

AU - Park, S. R.

AU - Kim, C.

AU - Kim, B. J.

AU - Oh, S. J.

AU - Kang, B. S.

AU - Noh, T. W.

AU - Park, B. H.

N1 - Funding Information: This work is supported (in part) by the Korean Science and Engineering Foundation through the Center for Strongly Correlated Materials Research. One of the authors (B.H.P.) was supported by the National Research Program for the 0.1 Terabit Non-volatile Memory Development sponsored by the Korea Ministry of Science and Technology. SSRL is operated by the DOE Office of Basic Energy Sciences, Divisions of Chemical Sciences and Materials Sciences. FIG. 1. Bi 4 Ti 3 O 12 crystal structure. One may replace Bi atoms by La to make Bi 4 − x La x Ti 3 O 12 . FIG. 2. (a) Photoexcitation of an electron from 3 p to 6 s orbitals in an isotropic environment (at the perovskite site). The 6 s orbital is symmetric due to the isotropic crystal field. (b) Excitation from 3 p to 6 s at the layer site. The 6 s orbital is deformed due to the anisotropic crystal field. FIG. 3. The La 3 p → 6 s XANES spectra for (a) small and (b) wide energy ranges. Corresponding energy window for the data in panel (a) is shown in panel (b) as a dotted rectangle. (c) Experimental configurations. The TEY was measured by taking the sample current through the LSCO layer. Definition of the polarization angle is also shown. θ = 0 ° (normal incidence) corresponds to the polarization in the a b plane. FIG. 4. La 3 p → 6 s XANES spectra calculated by FEFF 8.0 for (a) the perovskite and (b) the layer sites.

PY - 2006/2/1

Y1 - 2006/2/1

N2 - We performed polarization-dependent x-ray absorption spectroscopy studies on epitaxially grown Bi4-xLaxTi3O12 thin films at the 3p→6s edges to find the La substitution site. Our results show a clear difference between the absorption spectra taken with parallel and perpendicular polarizations, which is consistent with the view that La replaces Bi in the layer rather than at the perovskite site. Calculated absorption spectra also support the interpretation. We therefore conclude that some, if not all, La atoms replace the Bi atoms in the layer.

AB - We performed polarization-dependent x-ray absorption spectroscopy studies on epitaxially grown Bi4-xLaxTi3O12 thin films at the 3p→6s edges to find the La substitution site. Our results show a clear difference between the absorption spectra taken with parallel and perpendicular polarizations, which is consistent with the view that La replaces Bi in the layer rather than at the perovskite site. Calculated absorption spectra also support the interpretation. We therefore conclude that some, if not all, La atoms replace the Bi atoms in the layer.

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