Electronic excitations around the substituted atom in La2Cu1 -yNiyO4 as seen via resonantinelastic x-ray scattering

Journal Article · Wed Mar 14 04:00:00 EDT 2012 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.85.104509· OSTI ID:1046996

Ishii, K; Cai, Y; Tsutsui, K; Ikeuchi, K; Jarrige, I; Mizuki, J; Hiraka, H; Yamada, K; Tohyama, T; Maekawa, S; Endoh, Y; Ishii, H

We perform a resonant inelastic x-ray scattering (RIXS) study of Ni-substituted La{sub 2}CuO{sub 4} and Cu-substituted La{sub 2}NiO{sub 4}. Resonantly enhanced charge-transfer excitations are successfully observed by tuning the incident photon energy to the K edge of the substituted element. These excitations display a very weak momentum dependence, evidencing their local character. We find a shift in the energy of the onset edge of these features compared with the nonsubstituted compounds La{sub 2}CuO{sub 4} and La{sub 2}NiO{sub 4}. This shift is quantitatively reproduced by exact diagonalization calculations of the RIXS spectra. RIXS is shown to be a powerful tool to probe the electronic states of substituted elements and to understand their interaction with surrounding atoms.

• Research Organization: BROOKHAVEN NATIONAL LABORATORY (BNL)
• Sponsoring Organization: USDOE SC OFFICE OF SCIENCE (SC)
• DOE Contract Number: AC02-98CH10886
• OSTI ID: 1046996
• Report Number(s): BNL--98190-2012-JA; 39KC02000
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 10 Vol. 85; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ATOMS
PHOTONS
PROBES
SCATTERING
SPECTRA
TUNING
cuprates
excitations
substitution
superconducting