Resonant Raman scattering at the L thresholds with final 3s hole in 3d2+ systems. II.  The CoO case in the whole L2,3 region

L. Braicovich, M. Taguchi, F. Borgatti, G. Ghiringhelli, A. Tagliaferri, N. B. Brookes, T. Uozumi, and A. Kotani
Phys. Rev. B 63, 245115 – Published 7 June 2001
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Abstract

We present experimental and theoretical results on CoO resonant Raman scattering (RRS) with excitation at many values in the whole Co2+L2,3 region, and with a final state containing a Co3s hole. The theory includes the final-state interaction between the configurations with one 3s hole and that with two 3p holes [configuration interaction (CI)]. A cluster calculation with CI reproduces the experimental results with excitation spanning the whole L3 region. In the L2 region the theory reproduces the evolution of the RRS doublet at higher outgoing energy. On this basis the role of CI and of the ligand hole effects are discussed vs the excitation energy. At least 5 eV above the L3 threshold, the experimental results show also a nondispersive component, with the intensity rapidly increasing with the excitation energy. The position and shape of this component are well reproduced by a model calculation accounting for all possible partitions between the transitions to the continuum and to the 3d shell. However, the intensity of the calculated nondispersive component is about an order of magnitude smaller than the measured one. The implications of this fact in terms of the dynamics of the intermediate state are outlined.

  • Received 22 September 2000

DOI:https://doi.org/10.1103/PhysRevB.63.245115

©2001 American Physical Society

Authors & Affiliations

L. Braicovich1, M. Taguchi2, F. Borgatti3, G. Ghiringhelli4,*, A. Tagliaferri1,†, N. B. Brookes4, T. Uozumi5, and A. Kotani6

  • 1INFM, Dipartimento di Fisica del Politecnico, P. L. da Vinci 32, 20133 Milano, Italy
  • 2The Abdus Salam International Center for Theoretical Physics, P.O. Box 586, 34100 Trieste, Italy
  • 3INFM, Dipartimento di Fisica dell’ Università, Via Campi, Modena, Italy
  • 4European Synchrotron Radiation Facility, Boîte Postale 220, 38043 Grenoble, France
  • 5College of Engineering, University of Osaka Prefecture, Gakuen-cho, Sakai 599-8531, Japan
  • 6Institute for Solid State Physics, University of Tokyo, Kashiwanoha, Kashiwa, Chiba 277-8581, Japan

  • *Present address: INFM, Dipartimento di Fisica del Politecnico, P. L. da Vinci 32, 20133 Milano, Italy.
  • Present address: European Synchrotron Radiation Facility, B.P. 220, 38043 Grenoble, France.

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Vol. 63, Iss. 24 — 15 June 2001

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