Anomalous electronic Raman scattering in Na_xCoO_2 H_2O

P. Lemmens; K. Y. Choi; V. Gnezdilov; E. Ya. Sherman; D. P. Chen; C. T. Lin; F. C. Chou; B. Keimer

doi:10.1103/PhysRevLett.96.167204

Anomalous electronic Raman scattering in Na_xCoO_2 H_2O

Strongly Correlated Electrons 2015-06-25 v1 Materials Science

Authors: P. Lemmens , K. Y. Choi , V. Gnezdilov , E. Ya. Sherman , D. P. Chen , C. T. Lin , F. C. Chou , B. Keimer

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Abstract

Raman scattering experiments on Na_{x}CoO_2 yH_2O single crystals show a broad electronic continuum with a pronounced peak around 100 cm-1 and a cutoff at approximately 560 cm-1over a wide range of doping levels. The electronic Raman spectra in superconducting and non-superconducting samples are similar at room temperature, but evolve in markedly different ways with decreasing temperature. For superconducting samples, the low-energy spectral weight is depleted upon cooling below T* sim 150K, indicating a opening of a pseudogap that is not present in non-superconducting materials. Weak additional phonon modes observed below T* suggest that the pseudogap is associated with charge ordering.

Keywords

electronic Raman scattering Na_xCoO_2 pseudogap charge ordering superconductivity

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@article{arxiv.cond-mat/0510756,
  title  = {Anomalous electronic Raman scattering in Na_xCoO_2 H_2O},
  author = {P. Lemmens and K. Y. Choi and V. Gnezdilov and E. Ya. Sherman and D. P. Chen and C. T. Lin and F. C. Chou and B. Keimer},
  journal= {arXiv preprint arXiv:cond-mat/0510756},
  year   = {2015}
}

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5 pages, 4 figures, for further information see www.peter-lemmens.de

Anomalous electronic Raman scattering in Na_xCoO_2 H_2O

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