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

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 $\sigma$${}_1$($\omega$) below T${}_{CDW}$ 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.

arXiv comment4 figures, 4 pages

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• Fabrication and superconductivity of NaxTaS2 crystals
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