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complex oxides

Our research interest is to reveal the atomic and electronic structure of the perovskite structure complex oxide using high-angle annular dark-field (HAADF) scanning transmission electron microscope (STEM) and analytical TEM (transmission electron microscope.) Local atomic structures are observed at sub-angstrom resolution and the electronic structure of characteristic atomic structures is investigated by interpreting EELS (electron energy loss spectroscopy) spectra.

 


Figure: a) HAADF-STEM image of a {[NdTiO3]16/[SrTiO3]8}3 superlattice structure. b) Ti3+ fraction across SrTiO3/NdTiO3/SrTiO3 as shown in panel c). d) Ti L2,3 and e) O K core-loss EELS spectra measured at the positions indicated in panel c). Reproduced from ref. [2].

Recommended Reading

  1. "A New Line Defect in NdTiO3 Perovskite"
    J. S. Jeong, M. Topsakal, P. Xu, B. Jalan, R. M. Wentzcovitch, K. A. Mkhoyan
    - Nano Lett. 16, 6816 (2016)

  2. "Quasi 2D Ultrahigh Carrier Density in a Complex Oxide Broken-Gap Heterojunction"
    P. Xu, T. C. Droubay, J. S. Jeong, K. A. Mkhoyan, P. V. Sushko, S. A. Chambers, B. Jalan
    - Adv. Mat. Interfaces 3, 1500432 (2016)  Highlighted on Phys.org News.

  3. "Hybrid molecular beam epitaxy for the growth of stoichiometric BaSnO3"
    A. Prakash, J. Dewey, H. Yun, J. S. Jeong, K. A. Mkhoyan, B. Jalan
    - J. Vac. Sci. Technol. A 33, 060608 (2015).   [Ed. Pick]

  4. "Stoichiometry-driven metal-to-insulator transition in NdTiO3/SrTiO3 heterostructures"
    P. Xu, D. Phelan, J. S. Jeong, K. A. Mkhoyan, B. Jalan
    - Appl. Phys. Lett. 104, 082109 (2014).

  5. "Observation of Electrically-Inactive Interstitials in Nb-Doped SrTiO3"
    J. S. Jeong, P. Ambwani, B. Jalan, C. Leighton, K. A. Mkhoyan
    - ACS Nano 7, 4487 (2013).
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Minneapolis, MN 55455 USA