Core-hole effect on dipolar and quadrupolar transitions of SrTiO3 and BaTiO3 at Ti K edge

Tomoyuki Yamamoto, Teruyasu Mizoguchi, Isao Tanaka

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Abstract

Experimental pre-edge fine structures in the x-ray absorption spectra of SrTiO3 and BaTiO3 at Ti K edge are successfully reproduced within the framework of first-principles one-electron theory using the full-potential augmented plane wave plus local orbitals method. The importance of the following two points has been demonstrated: (1) proper inclusion of a Ti 1s core-hole using a large supercell, and (2) consideration of both dipolar and quadrupolar transitions. The core-hole effect is found to be more significant for quadrupolar transitions that form the first two peaks of the pre-edge structure, i.e., p1 to p2. They correspond to t2g and eg bands of the core-holed Ti. The other two peaks, p3 and p4, are found to be entirely due to the dipolar transition.

Original languageEnglish
Article number245113
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume71
Issue number24
DOIs
Publication statusPublished - 2005 Jun 15

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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