Observation of a 500 meV collective mode in La2-xSrxCuO4 and Nd2CuO4 using resonant inelastic X-ray scattering

J. P. Hill, Girsh Blumberg, Young June Kim, D. S. Ellis, S. Wakimoto, R. J. Birgeneau, Seiki Komiya, Yoichi Ando, B. Liang, R. L. Greene, D. Casa, T. Gog

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Abstract

Utilizing resonant inelastic x-ray scattering, we report a previously unobserved mode in the excitation spectrum of La2-xSrxCuO4 and Nd2CuO4 at 500 meV. The mode is peaked around the (π, 0) point in reciprocal space and is observed to soften, and broaden, away from this point. Samples with x=0, 0.01, 0.05, and 0.17 were studied. The new mode is found to be rapidly suppressed with increasing Sr content and is absent at x=0.17, where it is replaced by a continuum of excitations. This mode is only observed when the incident x-ray polarization is normal to the CuO planes.

Original languageEnglish (US)
Article number097001
JournalPhysical review letters
Volume100
Issue number9
DOIs
StatePublished - Mar 6 2008

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Hill, J. P., Blumberg, G., Kim, Y. J., Ellis, D. S., Wakimoto, S., Birgeneau, R. J., Komiya, S., Ando, Y., Liang, B., Greene, R. L., Casa, D., & Gog, T. (2008). Observation of a 500 meV collective mode in La2-xSrxCuO4 and Nd2CuO4 using resonant inelastic X-ray scattering. Physical review letters, 100(9), [097001]. https://doi.org/10.1103/PhysRevLett.100.097001