Dimensionality and doping effect on the Core-level X-ray photoemission satellites in layered ruthenates.

ORAL

Abstract

Core-level photoelectron spectra of the layered perovskite crystal Sr$_{n+1}$Ru$_{n}$O$_{3n+1}$ (n = 1, 2, and 3) and Mn-doped Sr$_{3}$Ru$_{2}$O$_{7}$ are investigated by x-ray photoemission spectroscopy (XPS) techniques. The Sr 3$d$ and Ru 3$d$ core-level spectra exhibit a two-peak structure, screened and unscreened peaks, indicating strong correlation effects among Ru 4$d$ electrons. However, there are little changes of the core-level satellite features with n, suggesting the electron-electron correlation is mainly confined in the RuO$_{2}$ plane. On the other hand, doping of Mn will drastically affect the core-level spectral weight, reflecting the doping-induced metal-to-insulator transition in the doped system. The position of Ru-core levels remain the same, thus, indicating no doping-induced change of Ru valence.

*The work was supported by NSF-DMR0346826 and DOD AMO-W911NF-07-0532.

–

Authors

  • Haizhong Guo

    • Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803, USA

  • Yi Li

    • Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803, USA

  • Biao Hu

    • Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803, USA

  • Rongying Jin

    • Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803, USA

  • E.W. Plummer

    • Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803, USA

  • Jiandi Zhang

    • Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803, USA

  • D. Urbina

    • Department of Physics, FIU, Miami, FL 33199, USA

  • Tijiang Liu

    • Physics Department, Tulane University, New Orleans, LA 70118, USA

  • David Fobes

    • Physics Department, Tulane University, New Orleans, LA 70118, USA

  • Zhiqiang Mao

    • Physics Department, Tulane University, New Orleans, LA 70118, USA