Anomalous electronic Raman scattering in Na_xCoO_2 H_2O

Details Anomalous electronic Raman scattering in Na_xCoO_2 H_2O Anomalous electronic Raman scattering in Na_xCoO_2 H_2O

2005-10-27

arxiv.org/abs/cond-mat/0510756v1

Phys. Rev. Lett. 96, 167204 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

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

Scientific paper

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.

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