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Phys. Rev. B 61, 1836–1840 (2000)

Polarization and momentum dependence of a charge-transfer excitation in Nd2CuO4

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K. Hämäläinen
Department of Physics, POB 9, FIN-00014 University of Helsinki, Finland

J. P. Hill
Department of Physics, Brookhaven National Laboratory, Upton, New York 11973

S. Huotari
Department of Physics, POB 9, FIN-00014 University of Helsinki, Finland

C.-C. Kao and L. E. Berman
NSLS, Brookhaven National Laboratory, Upton, New York 11973

A. Kotani and T. Idé
Institute for Solid State Physics, University of Tokyo, Roppongi, Minato-ku, Tokyo 106, Japan

J. L. Peng and R. L. Greene
Center for Superconductivity Research, Department of Physics and Astronomy, University of Maryland, College Park, Maryland 20742

Received 10 June 1999; revised 21 September 1999; published in the issue dated 15 January 2000

We report the polarization and q dependence of 6-eV charge-transfer excitation in Nd2CuO4, as studied by resonant inelastic x-ray scattering. The incident polarization is shown to select the intermediate states participating in the resonant process, and resonances associated with 1s⃗4pσ and 1s⃗4pπ transitions are resolved. No enhancement is observed for the 1s¯3d10L¯ well-screened intermediate states in either case. Numerical calculations show that this is the result of nonlocal effects. The intensity and position of the excitation was found to be independent of the momentum transfer along the c axis for q=3.5–7.9 Å -1.

© 2000 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.61.1836
DOI:
10.1103/PhysRevB.61.1836
PACS:
71.27.+a, 74.25.Jb, 74.72.-h, 78.70.Ck
 
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