Volume 79, Number 4, August 2007
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||26 July 2007|
Observation of multiple Zhang-Rice excitations in a correlated solid: Resonant inelastic X-ray scattering study of Li2CuO2
Department of Physics, Boston University - 590 Commonwealth Ave., Boston, MA 02215, USA
2 School of Physics, Trinity College Dublin - Dublin 2, Ireland
3 Physics Department, Macquarie University - NSW 2109, Australia
4 Department of Physics, Uppsala University - Box 530, S-75121, Uppsala, Sweden
5 Advanced Light Source, Lawrence Berkeley National Laboratory - Berkeley, CA 94720, USA
6 Center for Materials Science and Engineering, Massachusetts Institute of Technology - Cambridge, MA 02139, USA
Corresponding author: firstname.lastname@example.org
Accepted: 2 July 2007
Multiple Zhang-Rice type spectral features have been observed in resonant inelastic X-ray scattering (RIXS) from the quasi–one-dimensional cuprate charge transfer insulator Li2CuO2. The first feature appears at constant emission energy, and is associated with a Zhang-Rice singlet final state. The second is an interplaquette charge transfer excitation that results in a novel triplet Zhang-Rice–type final state. It is accompanied by the presence of a O 2p nonbonding to upper Hubbard band excitation at an energy close to that of a calculated triplet charge transfer Zhang-Rice–type excitation. The site selectivity and polarization rules associated with RIXS allows these two excitations to be distinguished.
PACS: 74.72.-h – Cuprate superconductors (high-Tc and insulating parent compounds) / 71.10.Li – Excited states and pairing interactions in model systems / 71.20.-b – Electron density of states and band structure of crystalline solids
© Europhysics Letters Association, 2007
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