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Title: 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:
 [1];  [1];  [2];  [3];  [4];  [5];  [5]
  1. Chung-Ang Univ., Seoul (South Korea)
  2. Braunschwig Univ. of Technology (Germany)
  3. SungKyunKwan Univ., Suwon (Korea)
  4. Pusan National Univ., Busan (Korea)
  5. 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}
}

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Works referencing / citing this record:

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