Unique identification of Zhang-Rice singlet excitation in Sr2CuO2Cl2 mediated by the O 1s core hole: Symmetry-selective resonant soft x-ray Raman scattering study

Yoshihisa Harada, Kozo Okada, Ritsuko Eguchi, Akio Kotani, Hidenori Takagi, Tomoyuki Takeuchi, Shik Shin

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

Zhang-Rice singlet excitation around 2 eV is observed, distinguished from Cu dd excitations, by a symmetry selective resonant soft x-ray Raman scattering (RSXRS) experiments at the O 1s edge excitation of Sr2CuO2Cl2. Well below Néel temperature the initial state of Sr2CuO2Cl2 is antiferromagnetic, and then the final state with the Zhang-Rice singlet is excited selectively when the photon polarization is conserved in the RSXRS process. We also observe a weak RSXRS structures around 0.5 eV in the controversial midinfrared region, taking advantage of extremely weak elastic scattering intensity in the O 1s edge. From its polarization dependence, it is interpreted to originate mainly from the two-spin-flip excitations.

Original languageEnglish
Article number165104
Pages (from-to)1651041-1651045
Number of pages5
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume66
Issue number16
Publication statusPublished - Oct 15 2002

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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