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Title: Structural instability of the CoO4 tetrahedral chain in SrCoO3-δ thin films

Journal Article · · Journal of Applied Physics
DOI:https://doi.org/10.1063/1.4929659· OSTI ID:1223660
 [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)
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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.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1223660
Journal Information:
Journal of Applied Physics, Vol. 118, Issue 8; ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 12 works
Citation information provided by
Web of Science

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Cited By (2)

Structural and spectroscopic characterization of the brownmillerite-type Ca2Fe2−xGaxO5 solid solution series journal September 2018
Tunable pH-dependent oxygen evolution activity of strontium cobaltite thin films for electrochemical water splitting journal January 2019

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