Raman spectroscopy study of NaxCoO2 and superconducting NaxCoO2.yH2O
arXiv:cond-mat/0404022 · doi:10.1103/PhysRevB.70.052502
Abstract
The Raman spectra of the parent compound NaxCoO2 (x=0.75) and the superconducting oxyhydrates NaxCoO2.yH2O with different superconducting temperatures (Tc) have been measured. Five Raman active phonons around 195 cm-1 (E1g), 482 cm-1, 522 cm-1, 616 cm-1 (3E2g), 663 cm-1 (A1g) appear in all spectra. These spectra change systematically along with the intercalation of H2O and superconducting properties. In particular, the Raman active phonons (A1g and E1g) involving the oxygen motions within the Co-O layers show up monotonous decrease in frequency along with superconducting temperature Tc. The fundamental properties and alternations of other active Raman phonons in the superconducting materials have also been discussed.
16 pages, 4 figures, 2 tables
References in corpus (4)
- Observation of Bulk Superconductivity in NaxCoO2.yH2O and NaxCoO2.yD2O Powder and Single Crystals
- Chemical Instability of the Cobalt Oxyhydrate Superconductor under Ambient Conditions
- Raman Phonons and Ageing-Related Surface Disorder in NaxCoO2
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- Rearrangement of Sodium ordering and its effect on physical properties in system
- Phonon scattering and stability of Na_0.5CoO_2
- Comment on "Raman spectroscopy study of NaxCoO2 and superconducting NaxCoO2 yH2O"
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- Influence of water intercalation on the electronic structure of the hydrated Na0.3CoO2.yH2O using a local spin density approximation
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