Structure and correlation effects in semiconducting SrTiO3

Young Jun Chang, Aaron Bostwick, Yong Su Kim, Karsten Horn, and Eli Rotenberg
Phys. Rev. B 81, 235109 – Published 10 June 2010

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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  • Received 8 February 2010

DOI:https://doi.org/10.1103/PhysRevB.81.235109

©2010 American Physical Society

Authors & Affiliations

Young Jun Chang1,2, Aaron Bostwick1, Yong Su Kim1,3, Karsten Horn2, and Eli Rotenberg1

  • 1Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  • 2Department of Molecular Physics, Fritz-Haber-Institut der Max-Planck-Gesellschaft, 14195 Berlin, Germany
  • 3Department of Applied Physics, Hanyang University, Ansan, Gyeonggi-do 426-791, Korea

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Issue

Vol. 81, Iss. 23 — 15 June 2010

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