Physics – Condensed Matter – Superconductivity
Scientific paper
2005-01-06
Phys. Rev. B 73, 014523 (2006)
Physics
Condensed Matter
Superconductivity
revised version 8 pages, 7 figures, to be published in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.73.014523
We report the in-plane optical measurements on Na$_x$CoO$_2$ with 0.18$\leq$x$\leq$0.92. The crystal growth and characterization were described in detail. The spectral weight increases monotonically with decreasing x. For sample with the lowest Na content x$\sim$0.18, the optical conductivity was strongly suppressed below 2200 $cm^{-1}$ at low temperature. The suppression becomes weaker with increasing Na content, and disappears in charge-ordered sample with x$\sim$0.5. At higher Na contents, similar suppression appears again but locates at higher energy scale near 3300 $cm^{-1}$. Our analysis indicates that those spectral features are dominated by a combination of electrons coupling to a bosonic mode and a pseudogap-like phenomenon. We suggest that the pseudogap-like phenomenon is purely a band structure effect. The infrared activated phonon modes were discussed in relation with the structural geometries.
Luo Jian-Lin
Wang Nan-Lin
Wu Dajing
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