Structural instability of the CoO4 tetrahedral chain in SrCoO3-δ thin films
Abstract
Raman scattering experiments together with detailed lattice dynamic calculations are performed to elucidate crystallographic and electronic peculiarities of SrCoO3-δ films. We observe that the 85 cm-1 phonon mode involving the rotation of a CoO4 tetrahedron undergoes a hardening by 21 cm-1 when the temperature is decreased. In addition, new phonon modes appear at 651.5 and 697.6 cm-1 . The latter modes are attributed to the Jahn-Teller activated modes. Upon cooling from room temperature, all phonons exhibit an exponential-like increase of intensity with a characteristic energy of about 103–107 K. We attribute this phenomenon to an instability of the CoO4 tetrahedral chain structure, which constitutes a key ingredient to understand the electronic and structural properties of the brownmillerite SrCoO2.5.
- Authors:
-
- Chung-Ang Univ., Seoul (South Korea)
- Braunschwig Univ. of Technology (Germany)
- SungKyunKwan Univ., Suwon (Korea)
- Pusan National Univ., Busan (Korea)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1223660
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Applied Physics
- Additional Journal Information:
- Journal Volume: 118; Journal Issue: 8; Journal ID: ISSN 0021-8979
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Glamazda, A., Choi, Kwang-yong, Lemmens, P., Choi, Woo Seok, Jeen, Hyoungjeen, Meyer, Tricia L., and Lee, Ho Nyung. Structural instability of the CoO4 tetrahedral chain in SrCoO3-δ thin films. United States: N. p., 2015.
Web. doi:10.1063/1.4929659.
Glamazda, A., Choi, Kwang-yong, Lemmens, P., Choi, Woo Seok, Jeen, Hyoungjeen, Meyer, Tricia L., & Lee, Ho Nyung. Structural instability of the CoO4 tetrahedral chain in SrCoO3-δ thin films. United States. https://doi.org/10.1063/1.4929659
Glamazda, A., Choi, Kwang-yong, Lemmens, P., Choi, Woo Seok, Jeen, Hyoungjeen, Meyer, Tricia L., and Lee, Ho Nyung. Mon .
"Structural instability of the CoO4 tetrahedral chain in SrCoO3-δ thin films". United States. https://doi.org/10.1063/1.4929659. https://www.osti.gov/servlets/purl/1223660.
@article{osti_1223660,
title = {Structural instability of the CoO4 tetrahedral chain in SrCoO3-δ thin films},
author = {Glamazda, A. and Choi, Kwang-yong and Lemmens, P. and Choi, Woo Seok and Jeen, Hyoungjeen and Meyer, Tricia L. and Lee, Ho Nyung},
abstractNote = {Raman scattering experiments together with detailed lattice dynamic calculations are performed to elucidate crystallographic and electronic peculiarities of SrCoO3-δ films. We observe that the 85 cm-1 phonon mode involving the rotation of a CoO4 tetrahedron undergoes a hardening by 21 cm-1 when the temperature is decreased. In addition, new phonon modes appear at 651.5 and 697.6 cm-1 . The latter modes are attributed to the Jahn-Teller activated modes. Upon cooling from room temperature, all phonons exhibit an exponential-like increase of intensity with a characteristic energy of about 103–107 K. We attribute this phenomenon to an instability of the CoO4 tetrahedral chain structure, which constitutes a key ingredient to understand the electronic and structural properties of the brownmillerite SrCoO2.5.},
doi = {10.1063/1.4929659},
journal = {Journal of Applied Physics},
number = 8,
volume = 118,
place = {United States},
year = {Mon Aug 31 00:00:00 EDT 2015},
month = {Mon Aug 31 00:00:00 EDT 2015}
}
Web of Science
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Works referencing / citing this record:
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