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20 April 2024 |
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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
; | | Date: |
27 Oct 2005 | | 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. | | Source: | arXiv, cond-mat/0510756 | | Services: | Forum | Review | PDF | Favorites | |
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