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 language | English |
|---|---|
| Article number | 165104 |
| Pages (from-to) | 1651041-1651045 |
| Number of pages | 5 |
| Journal | Physical Review B - Condensed Matter and Materials Physics |
| Volume | 66 |
| Issue number | 16 |
| Publication status | Published - Oct 15 2002 |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
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Harada, Y., Okada, K., Eguchi, R., Kotani, A., Takagi, H., Takeuchi, T., & Shin, S. (2002). 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. Physical Review B - Condensed Matter and Materials Physics, 66(16), 1651041-1651045. [165104].