Investigation of the unoccupied states in Sr2YRuO6 single crystals doped with Cu

Details Investigation of the unoccupied states in Sr2YRuO6 single crystals doped with Cu Investigation of the unoccupied states in Sr2YRuO6 single crystals doped with Cu

Jul 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009njph...11g3024c&link_type=abstract

New Journal of Physics, Volume 11, Issue 7, pp. 073024 (2009).

Physics

1

Scientific paper

The electronic structure single crystals of the new double perovskite Sr2YRu1-xCuxO6 (x = 0-0.05) has been investigated by x-ray absorption near-edge structure (XANES) spectroscopy. The Cu K-edge spectra show that Cu is incorporated as Cu1+ and Cu2+ in the crystals grown in air and in an oxygen atmosphere and Ru5+ is seen in the Ru K-edge spectra. The O K-edge and the Ru L3-edge spectra indicate an increase in the unoccupied states (hole concentration) as x is increased, accompanied by a lattice distortion from an increased O-Ru-O bond angle. These changes observed even with a small Cu addition are interpreted to result from the Cu 3d-O 2p hybridization as Cu replaces Ru in the octahedral sites.

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