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Lee, Jun Hee
Quantum Materials for Energy Conversion Lab.
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Reversal of the Lattice Structure in SrCoOx Epitaxial Thin Films Studied by Real-Time Optical Spectroscopy and First-Principles Calculations

Author(s)
Choi, Woo SeokJeen, HyoungjeenLee, JunHeeSeo, S. S. AmbroseCooper, Valentino R.Rabe, Karin M.Lee, Ho Nyung
Issued Date
2013-08
DOI
10.1103/PhysRevLett.111.097401
URI
https://scholarworks.unist.ac.kr/handle/201301/18601
Fulltext
http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.111.097401
Citation
PHYSICAL REVIEW LETTERS, v.111, no.9, pp.097401
Abstract
Using real-time spectroscopic ellipsometry, we directly observed a reversible lattice and electronic structure evolution in SrCoOx (x = 2.5-3) epitaxial thin films. Drastically different electronic ground states, which are extremely susceptible to the oxygen content x, are found in the two topotactic phases: i.e., the brownmillerite SrCoO2.5 and the perovskite SrCoO3. First-principles calculations confirmed substantial differences in the electronic structure, including a metal-insulator transition, which originate from the modification in the Co valence states and crystallographic structures. More interestingly, the two phases can be reversibly controlled by changing the ambient pressure at greatly reduced temperatures. Our finding provides an important pathway to understanding the novel oxygen-content-dependent phase transition uniquely found in multivalent transition metal oxides
Publisher
AMER PHYSICAL SOC
ISSN
0031-9007
Keyword
NB-DOPED SRTIO3TRANSPORT-PROPERTIESPEROVSKITE OXIDESTEMPERATURESDIFFUSIONREDUCTIONOXIDATIONBATTERIES

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