Phonon properties of intrinsic insulating phase of the cobalt oxide superconductor NaCoO2
| Autor: | A. Troper, Mina Talati, Ivan C. da Cunha Lima, Prafulla K. Jha, S.P. Sanyal |
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| Rok vydání: | 2005 |
| Předmět: |
Superconductivity
Materials science Condensed matter physics Phonon Infrared Surface phonon Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Condensed Matter Physics Spectral line Electronic Optical and Magnetic Materials Condensed Matter::Materials Science symbols.namesake Condensed Matter::Superconductivity symbols Condensed Matter::Strongly Correlated Electrons Electrical and Electronic Engineering Raman spectroscopy Cobalt oxide Debye model |
| Zdroj: | Physica B: Condensed Matter. 366:153-161 |
| ISSN: | 0921-4526 |
| Popis: | We report a systematic and detailed lattice dynamical investigation on the intrinsic insulating phase of the cobalt oxide superconductor NaCoO 2 . The phonon dispersion curves, partial and total phonon densities of states are obtained. The calculated Raman, infrared phonon modes and generalized phonon density of states agree reasonably well with the experimental spectra. These studies have enabled an atomic level understanding of the phonon density of states. The effect of Na site occupancy on the phonon spectra are discussed and found significant differences. The lattice specific heat at constant volume and Debye temperature are also reported. The estimated Debye temperature reveals the importance of phonons in the transport properties in the intrinsic insulating phase of the NaCoO 2 compound at room temperature. The temperature dependence of the vibrational amplitudes has also been discussed. |
| Databáze: | OpenAIRE |
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