Structure and correlation effects in semiconducting SrTiO3

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

Research output: Contribution to journalArticlepeer-review

81 Scopus citations


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.

Original languageEnglish
Article number235109
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number23
StatePublished - 10 Jun 2010


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