TY - JOUR
T1 - Unique identification of Zhang-Rice singlet excitation in Sr2CuO2Cl2 mediated by the O 1s core hole
T2 - Symmetry-selective resonant soft x-ray Raman scattering study
AU - Harada, Yoshihisa
AU - Okada, Kozo
AU - Eguchi, Ritsuko
AU - Kotani, Akio
AU - Takagi, Hidenori
AU - Takeuchi, Tomoyuki
AU - Shin, Shik
PY - 2002/10/15
Y1 - 2002/10/15
N2 - 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.
AB - 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.
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M3 - Article
AN - SCOPUS:0037110163
VL - 66
SP - 1651041
EP - 1651045
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 1098-0121
IS - 16
M1 - 165104
ER -