Spin-Resolved Photoemission on Anti-Ferromagnets: Direct Observation of 
Zhang-Rice Singlets in CuO

Tjeng, L. H.; Sinkovic, B.; Brookes, N. B.; Goedkoop, J. B.; Hesper, R.; Pellegrin, E.; de Groot, F. M. F.; Altieri, S.; Hulbert, S. L.; Shekel, E.; Sawatzky, G. A.

doi:10.1103/PhysRevLett.78.1126

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Spin-Resolved Photoemission on Anti-Ferromagnets: Direct Observation of Zhang-Rice Singlets in CuO

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Citation

Tjeng, L. H., Sinkovic, B., Brookes, N. B., Goedkoop, J. B., Hesper, R., Pellegrin, E., et al. (1997). Spin-Resolved Photoemission on Anti-Ferromagnets: Direct Observation of Zhang-Rice Singlets in CuO. Physical Review Letters, 78(6), 1126-1129. doi:10.1103/PhysRevLett.78.1126.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0019-1D91-A

Abstract

We demonstrate that it is possible to obtain spin-resolved valence band spectra with a very high degree of spin polarization from antiferromagnetic transition metal materials if the excitation light is circularly polarized and has an energy close to the cation 2p(3/2) (L(3)) white line. We are able to unravel the different spin states in the single-particle excitation spectrum of CuO and show that the top of the valence band is of pure singlet character, which provides strong support for the existence and stability of Zhang-Rice singlets in high-T-c superconductors.