Reversal of the lattice structure in SrCoOx epitaxial thin films studied by real-time optical spectroscopy and first-principles calculations

Woo Seok Choi, Hyoungjeen Jeen, Jun Hee Lee, S. S.Ambrose Seo, Valentino R. Cooper, Karin Rabe, Ho Nyung Lee

Research output: Contribution to journalArticle

37 Citations (Scopus)

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.

Original languageEnglish (US)
Article number097401
JournalPhysical review letters
Volume111
Issue number9
DOIs
StatePublished - Aug 27 2013

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electronic structure
oxygen
thin films
spectroscopy
ellipsometry
metal oxides
transition metals
insulators
valence
ground state
electronics
metals
temperature

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Choi, Woo Seok ; Jeen, Hyoungjeen ; Lee, Jun Hee ; Seo, S. S.Ambrose ; Cooper, Valentino R. ; Rabe, Karin ; Lee, Ho Nyung. / Reversal of the lattice structure in SrCoOx epitaxial thin films studied by real-time optical spectroscopy and first-principles calculations. In: Physical review letters. 2013 ; Vol. 111, No. 9.
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Reversal of the lattice structure in SrCoOx epitaxial thin films studied by real-time optical spectroscopy and first-principles calculations. / Choi, Woo Seok; Jeen, Hyoungjeen; Lee, Jun Hee; Seo, S. S.Ambrose; Cooper, Valentino R.; Rabe, Karin; Lee, Ho Nyung.

In: Physical review letters, Vol. 111, No. 9, 097401, 27.08.2013.

Research output: Contribution to journalArticle

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T1 - Reversal of the lattice structure in SrCoOx epitaxial thin films studied by real-time optical spectroscopy and first-principles calculations

AU - Choi, Woo Seok

AU - Jeen, Hyoungjeen

AU - Lee, Jun Hee

AU - Seo, S. S.Ambrose

AU - Cooper, Valentino R.

AU - Rabe, Karin

AU - Lee, Ho Nyung

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AB - 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.

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