The electronic structure of phase separated KxFe2-y Se-2 has been studied by means of x-ray absorption spectroscopy (XAS) and photoemission spectroscopy. Both Fe L-2,L-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 L-2,L-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 L-2,L-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 K-x Fe2-y Se-2 driven by the Fe 3d states.
X-ray absorption and photoemission spectroscopy of electronic phase separation inKxFe2−ySe2 / Saini, Naurang Lal; T., Mizokawa; E., Magnano; S., Nappini; F., Bondino; H., Takeya; Y., Mizuguchi; Y., Takano; K. B., Garg. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - 90:(2014). [10.1103/PhysRevB.90.184510]
X-ray absorption and photoemission spectroscopy of electronic phase separation inKxFe2−ySe2
SAINI, Naurang Lal;
2014
Abstract
The electronic structure of phase separated KxFe2-y Se-2 has been studied by means of x-ray absorption spectroscopy (XAS) and photoemission spectroscopy. Both Fe L-2,L-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 L-2,L-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 L-2,L-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 K-x Fe2-y Se-2 driven by the Fe 3d states.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.