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Bulk screening in core-level photoemission from Mott-Hubbard and charge-transfer systems

2005; American Physical Society; Volume: 71; Issue: 15 Linguagem: Inglês

10.1103/physrevb.71.155102

1550-235X

M. Taguchi, A. Chainani, N. Kamakura, Koji Horiba, Y. Takata, Makina Yabashi, Kenji Tamasaku, Yoshinori Nishino, D. Miwa, Tetsuya Ishikawa, Shik Shin, E. Ikenaga, T. Yokoya, Keisuke Kobayashi, T. Mochiku, K. Hirata, K. Motoya,

Electronic and Structural Properties of Oxides

We report bulk-sensitive hard x-ray $(h\ensuremath{\nu}=5.95\phantom{\rule{0.3em}{0ex}}\mathrm{keV})$ core-level photoemission spectroscopy (PES) of single crystal ${\mathrm{V}}_{1.98}{\mathrm{Cr}}_{0.02}{\mathrm{O}}_{3}$ and the high-${T}_{c}$ cuprate ${\mathrm{Bi}}_{2}{\mathrm{Sr}}_{2}\mathrm{Ca}{\mathrm{Cu}}_{2}{\mathrm{O}}_{8+\ensuremath{\delta}}$ (Bi2212). ${\mathrm{V}}_{1.98}{\mathrm{Cr}}_{0.02}{\mathrm{O}}_{3}$ exhibits low binding energy ``satellites'' to the V $2p$ ``main lines'' in the metallic phase, which are suppressed in the antiferromagnetic insulator phase. In contrast, the Cu $2p$ spectra of Bi2212 do not show temperature-dependent features, but a comparison with soft x-ray PES indicates a large increase in the $2{p}^{5}3{d}^{9}$ satellites or $3{d}^{9}$ weight in the bulk. Cluster model calculations, including a full multiplet structure and a screening channel derived from the coherent band at the Fermi energy, give very satisfactory agreement with the experiments.