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Optical properties of the Ce and La di-telluride charge density
wave compounds
M. Lavagnini, A. Sacchetti and L. Degiorgi
Laboratorium fur Festkorperphysik, ETH - Zurich, CH-8093 Zurich, Switzerland.
K.Y. Shin and I.R. Fisher
Geballe Laboratory for Advanced Materials and Department of Applied Physics,
Stanford University, Stanford, California 94305-4045, USA.
(Dated: October 28, 2009)
Abstract
The La and Ce di-tellurides LaTe2 and CeTe2 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.
PACS numbers: 71.45.Lr,78.20.-e
SIMES, SLAC National Accelerator Center, 2575 Sand Hill Road, Menlo Park, CA 94309
Work supported in part by US Department of Energy contract DE-AC02-76SF00515.
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