Phonon scattering and stability of Na_0.5CoO_2

Details Phonon scattering and stability of Na_0.5CoO_2 Phonon scattering and stability of Na_0.5CoO_2

2004-12-23

arxiv.org/abs/cond-mat/0412656v1

Physica B 359-361, 424 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

2 pages, 2 figures, proceeding of the SCES'04, July 2004, further information see http://www.peter-lemmens.de

Scientific paper

10.1016/j.physb.2005.01.085

Raman scattering experiments have been performed on Na_xCoO_2 as 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 (T_max=550 K) with the initial presence of water vapor at ambient conditions reveals an irreversible structural instability of this composition.

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