Optical study of the charge-density-wave mechanism in 2$H$-TaS$_2$ and Na$_x$TaS$_2$

W. Z. Hu; G. Li; J. Yan; H. H. Wen; G. Wu; X. H. Chen; N. L. Wang

doi:10.1103/PhysRevB.76.045103

paper

Optical study of the charge-density-wave mechanism in 2 $H$ -TaS $_{2}$ and Na $_{x}$ TaS $_{2}$

arXiv:cond-mat/0703166 · doi:10.1103/PhysRevB.76.045103

Abstract

We report an optical study of transition metal dichalcogenide 2 $H$ -TaS $_{2}$ and Na intercalated superconductor Na $_{x}$ TaS $_{2}$ over a broad frequency range at various temperatures. A clear gap feature was observed for 2 $H$ -TaS $_{2}$ when it undergoes a CDW transition. The existence of a Drude component in $σ$ $_{1}$ ( $ω$ ) below T $_{C D W}$ indicates that the Fermi surface of 2 $H$ -TaS $_{2}$ is only partially gapped in CDW state. The spectral evolution of two different Na $_{x}$ TaS $_{2}$ crystals further confirms that the partial gap structure observed in 2 $H$ -TaS $_{2}$ has a CDW origin. The CDW mechanism for 2 $H$ -TaS $_{2}$ , the competition between CDW and superconductivity in Na $_{x}$ TaS $_{2}$ system are discussed.

4 figures, 4 pages

References in corpus (1)

Quasi-Particle Spectra, Charge-Density-Wave, Superconductivity and Electron-Phonon Coupling in 2H-NbSe2

Optical study of the charge-density-wave mechanism in 2H-TaS2​ and Nax​TaS2​

Abstract

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Optical study of the charge-density-wave mechanism in 2 $H$ -TaS $_{2}$ and Na $_{x}$ TaS $_{2}$