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Journal Article

Probing the singlet character of the two-hole states in cuprate superconductors

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Ghiringhelli, G., Brookes, N. B., Tjeng, L. H., Mizokawa, T., Tjernberg, O., Steeneken, P. G., et al. (2002). Probing the singlet character of the two-hole states in cuprate superconductors. Physica B-Condensed Matter, 312, 34-35. doi:10.1016/S0921-4526(01)01488-0.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0019-175B-1
Using spin-resolved resonant photoemission we have probed the singlet vs. triplet character of the two-hole state in the layered cuprates Bi2Sr2CaCu2O8+delta La2-xSrxCuO4 and Sr2CuO2Cl2. The combination of the photon circular polarization with the photoelectron spin detection gives access to the character of the photoemission final states, which correspond to the two-hole configurations localized at a (CuO4) site. In particular, the lowest energy state is found to have a very high singlet character in all the measured compounds. This can be considered as a strong indication of the existence and stability of the so-called Zhang-Rice singlets in the layered cuprates. (C) 2002 Elsevier Science B.V. All rights reserved.