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

Journal Article · Sat Feb 01 00:00:00 EST 1997 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.78.1126· OSTI ID:450468

Tjeng, L; Hesper, R; Pellegrin, E; de Groot, F; Altieri, S; Sawatzky, G ^[1]; Sinkovic, B; Shekel, E ^[2]; Brookes, N; Goedkoop, J ^[3]; Hulbert, S ^[4]

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1. Solid State Physics Laboratory, Materials Science Centre, University of Groningen, Nijenborgh 4, 9747 AG Groningen (The Netherlands)
2. Physics Department, New York University, 2 Washington Place, New York, New York 10003 (United States)
3. European Synchrotron Radiation Facility, B.P. 220, 38043 Grenoble Cedex (France)
4. National Synchrotron Light Source, Brookhaven National Laboratory, Upton, New York 11973 (United States)

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{sub 3/2} (L{sub 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{sub c} superconductors. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 450468
• Journal Information: Physical Review Letters, Vol. 78, Issue 6; Other Information: PBD: Feb 1997
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COPPER OXIDES
ELECTRONIC STRUCTURE
PHOTOEMISSION
HIGH-TC SUPERCONDUCTORS
SYNCHROTRON RADIATION
SPIN
ANTIFERROMAGNETISM
POLARIZATION