Phonon scattering and stability of Na_0.5CoO_2

B. Keimer; C.T. Lin; D.P. Chen; F.C. Chou; K.Y. Choi; P. Lemmens; V. Gnezdilov; X.N. Zhang

arxiv: cond-mat/0412656 · v1 · submitted 2004-12-23 · ❄️ cond-mat.str-el · cond-mat.mtrl-sci

Phonon scattering and stability of Na₀.5CoO₂

X.N. Zhang , P. Lemmens , V. Gnezdilov , K.Y. Choi , B. Keimer , D.P. Chen , C.T. Lin , F.C. Chou This is my paper

classification ❄️ cond-mat.str-el cond-mat.mtrl-sci

keywords beencompositioninstabilityobservedphononscatteringstructuraladditional

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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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Phonon scattering and stability of Na₀.5CoO₂

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