Charge density wave modulation and gap measurements in CeTe${}_3$

Abstract

We present a study of charge density wave (CDW) ordering in CeTe${}_3$ at room temperature using a scanning tunneling microscope and Raman spectroscopy. Two characteristic CDW ordering wavevectors obtained from the Fourier analysis are assessed to be $|{\text{c}}^{\ast }-\mathbf{q}|=4.19{\mathrm{nm}}^{-1}$ and $|\mathbf{q}|=10.26{\mathrm{nm}}^{-1}$ where $|{\mathbf{c}}^{\ast }|=2\pi /c$ is the reciprocal lattice vector. The scanning tunneling spectroscopy measurements, along with inelastic light (Raman) scattering measurements, show a CDW gap ${\Delta }_{\max }$ of approximately 0.37 eV. In addition to the CDW modulation, we observe an organization of the Te sheet atoms in an array of alternating V- and N- groups along the CDW modulation, as predicted in the literature.

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