Core-Level X-Ray Photoemission Satellites in Ruthenates: A New Mechanism Revealing the Mott Transition

Abstract

Ru 3d core-level x-ray photoemission spectra of various ruthenates are examined. They show in general two-peak structures, which can be assigned as the screened and unscreened peaks. The screened peak is absent in a Mott insulator, but develops into a main peak in the metallic regime. This spectral behavior is well explained by the dynamical mean-field theory calculation for the single-band Hubbard model with on-site core-hole potential using the exact diagonalization method. The new mechanism of the core-level photoemission satellite can be utilized to reveal the Mott transition phenomenon in various strongly correlated electron systems, especially in nano-scale devices and phase-separated materials.

4 pages, 5 figures, submitted to PRL

References in corpus (3)

• Electronic structure and magnetism in Ru based perovskites
• Prominent quasi-particle peak in the photoemission spectrum of the metallic phase of V_2O_3
• Surface Core-Level Shifts at an oxygen-rich Ru Surface: O/Ru(0001) vs. RuO_2(110)

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