Electronic Structure of Doped Lanthanum Cuprates Studied with Resonant Inelastic X-Ray Scattering
| Autor: | Ellis, D. S., Kim, Jungho, Zhang, Harry, Hill, J. P., Gu, Genda, Komiya, Seiki, Ando, Yoichi, Casa, D., Gog, T., Kim, Young-June |
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| Rok vydání: | 2011 |
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| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.83.075120 |
| Popis: | We report a comprehensive Cu $K$-edge RIXS investigation of $\rm La_{2-x}Sr_xCuO_4$ (LSCO) for 0$\leq$x$\leq$0.35, stripe-ordered $\rm La_{1.875}Ba_{0.125}CuO_4$ (LBCO), and $\rm La_{2}Cu_{0.96}Ni_{0.04}O_4$ (LCNO) crystals. The RIXS spectra measured at three high-symmetry momentum transfer (\textbf{q}) positions are compared as a function of doping and for the different dopants. The spectra in the energy range 1-6 eV can be described with three broad peaks, which evolve systematically with increased doping. The most systematic trend was observed for \textbf{q}=($\pi$, 0) corresponding to the zone boundary. As hole doping increased, the spectral weight transfer from high energies to low energies is nearly linear with \emph{x} at this \textbf{q}. We interpret the peaks as interband transitions in the context of existing band models for this system, assigning them to Zhang-Rice band$\rightarrow$upper Hubbard band, lower-lying band$\rightarrow$upper Hubbard band, and lower-lying band$\rightarrow$Zhang-Rice band transitions. The spectrum of stripe-ordered LBCO was also measured, and found to be identical to the correspondingly doped LSCO, except for a relative enhancement of the near-infrared peak intensity around 1.5-1.7 eV. The temperature dependence of this near-infrared peak in LBCO was more pronounced than for other parts of the spectrum, continuously decreasing in intensity as the temperature was raised from 25 K to 300 K. Finally, we find that 4\% Ni substitution in the Cu site has a similar effect on the spectra as does Sr substitution in the La site. Comment: 10 pages (according to my pdf), 8 figures. Was accepted for publication in PRB. When I did the preview in the previous step, somehow figure 2 looked very broken into pieces ? |
| Databáze: | arXiv |
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