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

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

2007-01-16

arxiv.org/abs/cond-mat/0701386v1

Phys. Rev. B75, 205133 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevB.75.205133

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.

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