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

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

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

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
Volume90
Issue number18
DOIs
Publication statusPublished - 2014 Nov 13
Externally publishedYes

Fingerprint

X ray absorption spectroscopy
Photoelectron spectroscopy
Absorption spectroscopy
x ray absorption
Phase separation
x ray spectroscopy
absorption spectroscopy
photoelectric emission
X rays
Fermi level
electronics
spectroscopy
x rays
orbitals
Excitation energy
Photoemission
Valence bands
Electronic structure
textures
Textures

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

X-ray absorption and photoemission spectroscopy of electronic phase separation in Kx Fe2-y Se2. / Saini, N. L.; Mizokawa, Takashi; Magnano, E.; Nappini, S.; Bondino, F.; Takeya, H.; Mizuguchi, Y.; Takano, Y.; Garg, K. B.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 90, No. 18, 184510, 13.11.2014.

Research output: Contribution to journalArticle

Saini, N. L. ; Mizokawa, Takashi ; Magnano, E. ; Nappini, S. ; Bondino, F. ; Takeya, H. ; Mizuguchi, Y. ; Takano, Y. ; Garg, K. B. / X-ray absorption and photoemission spectroscopy of electronic phase separation in Kx Fe2-y Se2. In: Physical Review B - Condensed Matter and Materials Physics. 2014 ; Vol. 90, No. 18.
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abstract = "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.",
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AU - Saini, N. L.

AU - Mizokawa, Takashi

AU - Magnano, E.

AU - Nappini, S.

AU - Bondino, F.

AU - Takeya, H.

AU - Mizuguchi, Y.

AU - Takano, Y.

AU - Garg, K. B.

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AB - 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.

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