Phonon scattering and stability of Na_0.5CoO_2
X.N. Zhang, P. Lemmens, V. Gnezdilov, K.Y. Choi, B. Keimer, D.P. Chen,, C.T. Lin, F.C. Chou
TL;DR
This study investigates phonon scattering and structural stability in Na_0.5CoO_2 using Raman spectroscopy, revealing additional phonon modes, irreversible structural changes upon annealing, and insights into its phase transition behavior.
Contribution
It provides new experimental data on phonon modes and structural instability specific to Na_0.5CoO_2, highlighting effects of temperature and annealing.
Findings
Additional phonon modes at x=0.5
Irreversible structural instability upon annealing
Structural changes linked to metal-insulator transition
Abstract
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.
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.