Structure and correlation effects in semiconducting SrTiO₃

Chang, Young Jun; Bostwick, Aaron; Kim, Yong Su; Horn, Karsten; Rotenberg, Eli

doi:10.1103/PhysRevB.81.235109

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Structure and correlation effects in semiconducting SrTiO₃

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Chang, Young Jun
Advanced Light Source, Lawrence Berkeley National Laboratory;
Molecular Physics, Fritz Haber Institute, Max Planck Society;

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Horn, Karsten
Molecular Physics, Fritz Haber Institute, Max Planck Society;

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Citation

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.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0011-253F-2

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 (d_yz and d_zx) bands to out-of-plane (d_xy) 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.