Phonon softening and "forbidden" mode observed by Raman scattering in Na0.5CoO2

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dc.creatorZhang, Q. M.
dc.creatoran, M.
dc.creatorYuan, S. K.
dc.creatorWu, Y.
dc.creatorWu, D.
dc.creatorLuo, J. L.
dc.creatorWang, N. L.
dc.creatorBao, W.
dc.creatorWang, Y. N.
dc.date2008-02-05
dc.date.accessioned2026-07-07T09:18:58Z
dc.date.available2026-07-07T09:18:58Z
dc.descriptionPolarized Raman scattering measurements have been performed on Na0.5CoO2 single crystal from 8 to 305 K. Both the A1g and E1g phonon modes show a softening below Tc1 ~ 83 K. Additionally, the A1g phonon mode, which is forbidden in the scattering geometry of cross polarization for the triangular CoO2 layers, appears below Tc1. In contrast, the metal-insulator transition at Tc2 ~ 46 K has only secondary effect on the Raman spectra. The phonon softening and the ``forbidden'' Raman intensity follow closely magnetic order parameter and the gap function at the Fermi surface, indicating that the distortion of CoO6 octahedra at Tc1, instead of the Na ordering at ~350 K, is the relevant structural component of the 83 K phase transition.
dc.description5 pages, 4 figures
dc.identifierhttps://arxiv.org/abs/0802.0721
dc.identifierhttp://arxiv.org/abs/0802.0721
dc.identifierPhys. Rev. B vol. 77, 045110 (2008)
dc.identifierdoi:10.1103/PhysRevB.77.045110
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/154222
dc.subjectStrongly Correlated Electrons
dc.subjectSuperconductivity
dc.titlePhonon softening and "forbidden" mode observed by Raman scattering in Na0.5CoO2
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