Optical properties of the Ce and La di-telluride charge density wave compounds

Abstract

The La and Ce di-tellurides LaTe${}_2$ and CeTe${}_2$ are deep in the charge-density-wave (CDW) ground state even at 300 K. We have collected their electrodynamic response over a broad spectral range from the far infrared up to the ultraviolet. We establish the energy scale of the single particle excitation across the CDW gap. Moreover, we find that the CDW collective state gaps a very large portion of the Fermi surface. Similarly to the related rare earth tri-tellurides, we envisage that interactions and Umklapp processes play a role in the onset of the CDW broken symmetry ground state.

References in corpus (2)

• Pressure dependence of the charge-density-wave gap in rare-earth tri-tellurides
• Chemical pressure and hidden one-dimensional behavior in rare earth tri-telluride charge density wave compounds

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• Pressure dependence of the optical properties of the charge-density-wave compound LaTe${}_2$
• Optical properties of the charge-density-wave polychalcogenide compounds $R_2$Te${}_5$ ($R$=Nd, Sm and Gd)
• Implications of Charge Ordering in the High Tc Cuprate Superconductors in the Far-infrared Spectroscopy