X-ray absorption and photoemission spectroscopy of electronic phase separation in Kx Fe2-y Se2

N. L. Saini, T. Mizokawa, E. Magnano, S. Nappini, F. Bondino, H. Takeya, Y. Mizuguchi, Y. Takano, K. B. Garg

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The electronic structure of phase separated KxFe2-ySe2 has been studied by means of x-ray absorption spectroscopy (XAS) and photoemission spectroscopy. Both Fe L2,3-edge XAS and Fe 2p photoemission spectra show a signature of the metallic phase that is embedded in the insulating texture. Valence-band spectra, measured with different excitation energies, reveal a finite density of states at the Fermi level driven by the Fe 3d orbitals. A combined analysis of the Se L2,3-edge and the Se K-edge XAS provides further information on a significant density of states of Se 4p character near the Fermi level, consistent with a large hybridization of these states with the Fe 3d orbitals. The K L2,3-edge XAS spectrum is also presented to show element specific partial density of states. The results are discussed in connection with the electronic phase separation in KxFe2-ySe2 driven by the Fe 3d states.

Original languageEnglish
Article number184510
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number18
Publication statusPublished - 2014 Nov 13


ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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