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Resolving CuO chain and CuO 2 plane contributions to the YBa 2 Cu 3 O 7−δ valence band by standing-wave excited hard x-ray photoelectron spectroscopy

DOI: 10.1103/PhysRevB.92.075117 DOI Help

Authors: S. Thiess (ESRF) , Tien-lin Lee (Diamond Light Source) , Carmela Aruta (National Research Council CNR-SPIN) , C. T. Lin (Max-Planck-Institut für Festkörperforschung) , F Venturini (ESRF) , N. B. Brookes (ESRF) , B. C. C. Cowie (ESRF) , J. Zegenhagen (ESRF)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 92

State: Published (Approved)
Published: August 2015

Abstract: We analyzed the valence band (VB) of the 90 K high-temperature superconductor YBa2Cu3O7−δ by photoelectron spectroscopy under standing-wave excitation employing hard x rays. Precisely positioning the standing-wave intensity in the unit cell allows selectively probing the VB yield from the CuO chains and CuO2 planes, respectively. Both contribute strongly over the whole VB but the spectral weight of the planes is significantly higher than the chains within about 2 eV from the Fermi level. In the x-ray regime, the major contribution to the VB emission is coming from Cu 3d.

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