Phonon scattering and stability of Na0.5CoO2

Authors

X. N. Zhang, Max Planck Institute
P Lemmens, Max Planck Institute
V Gnezdilov, B. I. Verkin Inst Low Temp Physics, Ukraine
K. Y. Choi, Tohoku University
B Keimer, Max Planck Institute
Dapeng Chen, Max-Planck-Institute For Solid State ResearchFollow
C T Lin, Max-Planck-Institute For Solid State ResearchFollow
F. C. Chou, Center for Materials Science and Engineering, USA

RIS ID

41038

Publication Details

Zhang, X., Lemmens, P., Gnezdilov, V., Choi, K., Keimer, B., Chen, D. P., Lin, C. & Chou, F. (2005). Phonon scattering and stability of Na0.5CoO2. Physica B: Condensed Matter, 359-361 (1-4), 424-426.

Abstract

Raman scattering experiments have been performed on NaxCoO2 as a function of temperature at the composition x=0.5 where a structural instability and a metal-insulator transition have been observed. Three additional phonon modes are observed compared to samples with larger x. An in situ annealing study (Tmax = 550K) with the initial presence of water vapor at ambient conditions reveals an irreversible structural instability of this composition.