Hard X-ray Cu 2p Core-Level Photoemission of High-T_c Cuprate Superconductors

2006/12/28 by Taguchi, M., Matsunami, M., Chainani, A. +17
#FOS: Physical sciences #Strongly Correlated Electrons (cond-mat.str-el) #Superconductivity (cond-mat.supr-con)

paper · doi:10.48550/arxiv.cond-mat/0612676

Abstract

We have performed a detailed study of Cu 2p core-level spectra in single layer La_2-xSr_xCuO₄, La doped Bi₂Sr_1.6La_0.4CuO_6+δ (Bi2201) and bilayer Bi₂Sr₂CaCu₂O_8+δ (Bi2212) high-temperature superconductors by using hard x-ray photoemission (HX-PES). We identify the Cu²⁺ derived (i) the Zhang-Rice singlet (ZRS) feature, (ii) the dⁿ⁺¹\underlineL (ligand screened) feature, (iii) the dⁿ satellite feature, as well as the hole-doping derived high binding energy feature in the main peak. In Bi-based cuprates, intensities of the dⁿ satellite features seem to be strongly enhanced compared to La_2-xSr_xCuO₄. From x-ray photon energy dependent measurements, it is shown that the increased intensity in the satellite region is associated with Bi 4s core-level spectral intensity. The corrected dⁿ satellite intensity is independent of the doping content or number of Cu-O layers. Our results suggest a correlation of the relative intensity of ZRS feature and hole-doping induced high binding energy spectral changes in the main peak with superconductivity.

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