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  Structure and correlation effects in semiconducting SrTiO₃

Chang, Y. J., Bostwick, A., Kim, Y. S., Horn, K., & Rotenberg, E. (2010). Structure and correlation effects in semiconducting SrTiO₃. Phyical Review B, 81(23): 235109. doi:10.1103/PhysRevB.81.235109.

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 Creators:
Chang, Young Jun1, 2, Author
Bostwick, Aaron1, Author
Kim, Yong Su1, 3, Author
Horn, Karsten2, Author           
Rotenberg, Eli1, Author
Affiliations:
1Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA, ou_persistent22              
2Molecular Physics, Fritz Haber Institute, Max Planck Society, ou_634545              
3Department of Applied Physics, Hanyang University, Ansan, Gyeonggi-do 426-791, Korea, ou_persistent22              

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 Abstract: We have investigated the effects of structure change and electron correlation on SrTiO₃ single crystals using angle-resolved photoemission spectroscopy. We show that the cubic to tetragonal phase transition at 105 K is manifested by a charge transfer from in-plane (dyz and dzx) bands to out-of-plane (dxy) band, which is opposite to the theoretical predictions. Along this second-order phase transition, we find a smooth evolution of the quasiparticle strength and effective masses. The in-plane band exhibits a peak-dip-hump lineshape, indicating a high degree of correlation on a relatively large (170 meV) energy scale, which is attributed to the polaron formation.

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Language(s): eng - English
 Dates: 2010-02-082010-05-172010-06-10
 Publication Status: Issued
 Pages: 4
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 Rev. Type: Peer
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Title: Phyical Review B
Source Genre: Journal
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Publ. Info: New York, NY : Published for the American Physical Society by the American Institute of Physics
Pages: - Volume / Issue: 81 (23) Sequence Number: 235109 Start / End Page: - Identifier: ISSN: 0163-1829
CoNE: https://pure.mpg.de/cone/journals/resource/110984073529068