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Condensed Matter > Strongly Correlated Electrons

arXiv:0709.3274 (cond-mat)
[Submitted on 20 Sep 2007]

Title:Observation of a 500meV Collective Mode in La$_{2-x}$Sr$_x$CuO$_4$ and Nd$_2$CuO$_4$

Authors:J. P. Hill, G. Blumberg, Young-June Kim, D. 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 La$_{2-x}$Sr$_x$CuO$_4$ at 500 meV. The mode is peaked around the ($\pi$,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. The peak is only observed when the incident x-ray polarization is normal to the CuO planes and is also present in Nd$_2$CuO$_4$. We suggest possible explanations for this excitation.
Comments: 5 pages, 5 figures
Subjects: Strongly Correlated Electrons (cond-mat.str-el); Superconductivity (cond-mat.supr-con)
Cite as: arXiv:0709.3274 [cond-mat.str-el]
  (or arXiv:0709.3274v1 [cond-mat.str-el] for this version)
  https://doi.org/10.48550/arXiv.0709.3274
Journal reference: Phys. Rev. Lett. 100, 097001 (2008).
Related DOI: https://doi.org/10.1103/PhysRevLett.100.097001

Submission history

From: Young-June Kim [view email]
[v1] Thu, 20 Sep 2007 18:39:57 UTC (40 KB)
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