Raman spectroscopy study of NaxCoO2 and superconducting NaxCoO2∙yH2O
Y. G. Shi, Y. L. Liu, H. X. Yang, C. J. Nie, R. Jin, J. Q. Li
DOI 10.1103/PhysRevB.70.052502 · Physical Review B
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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 195cm−1 (E1g), 482cm−1, 522cm−1, 616cm−1 (3E2g), and 663cm−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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Na0.3CoO2*1.3H2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5 | Pressure not reported | unknown |
| NaxCoO2*1.3H2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.2 | Pressure not reported | unknown |
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