Phonon softening and forbidden mode in Na_(0.5)CoO_2 observed by Raman scattering

Qingming Zhang; Ming An; Shikui YuanYong WuDong WuJianlin LuoNanlin WangWei BaoYening Wang

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Phonon softening and forbidden mode in Na_(0.5)CoO_2 observed by Raman scattering

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Polarized Raman scattering measurements have been performed on Na_(0.5)CoO_2 single crystal from 8 to 305 K. Both the A_(1g) and E_(1g) phonon modes show a softening below T_(c1) ≈ 83 K. Additionally, the A_(1g) phonon mode, which is forbidden in the scattering geometry of cross polarization for the triangular CoO_2 layers, appears below T_(c1). In contrast, the metal-insulator transition at T_(c2) ≈ 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 CoO_6 octahedra at T_(c1) instead of the Na ordering at ～350 K, is the relevant structural component of the 83 K phase transition.

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《Physical review, B. Condensed matter and materials physics》 |2008年第4期|045110.1-045110.5|共9页
作者
Qingming Zhang; Ming An; Shikui YuanYong WuDong WuJianlin LuoNanlin WangWei BaoYening Wang;
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作者单位

Department of Physics, Renmin University of China, Beijing 100872, People's Republic of China;

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正文语种英语
中图分类固体物理学;
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infrared and raman spectra; strongly correlated electron systems; heavy fermions; phonons;

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Phonon softening and forbidden mode in Na_(0.5)CoO_2 observed by Raman scattering

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