Optical properties of the Ce and La ditelluride charge density wave compounds Page: 4 of 13
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0.8 ------- Lale
100 1000 10000
FIG. 1: R(w) of LaTe2 and CeTe2 at 300 K. The inset is a blow-up of R(w) emphasizing the broad
mid infrared absorption feature in the spectral range around 6000 cm-1. The arrows mark the
shallow minimum in R(w) at the onset of the broad absorption, peaked between 5000 and 6000
cm-1 and overlapped to the plasma edge feature.
II. EXPERIMENT AND RESULTS
We report the first comprehensive optical study on LaTe2 and CeTe2 single crystals,
which were grown in this case by slow cooling a binary melt, as described previously in
Ref. 5. Samples grown by this technique are as close to stoichiometric as possible, having
compositions CeTe2.00 and LaTe1.95 as determined by electron microprobe analysis using
elemental standards, with an uncertainty of +/- 0.03 in the Te content. The crystals were
polished in order to achieve a clean surface for the reflectivity measurements. Exploiting
several spectrometers and interferometers, the optical reflectivity R(w) was measured for
all samples from the far-infrared (6 meV) up to the ultraviolet (6 eV) spectral range, with
light polarized parallel to the Te planes. Details pertaining to the experiments can be found
elsewhere [11, 12, 13].
Figure 1 displays R(o) for both title compounds over the whole investigated spectral
range. R(o) does not display any temperature dependence between 300 and 10 K in the
covered energy interval and merges to total reflection for frequency going to zero for both
compounds. The R(o) spectra are therefore typical of an overall metallic behaviour. Over-
lapped to the plasma edge feature (for cc < 104 cm-1) one can observe furthermore a rather
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Lavagnini, M.; Sacchetti, A.; Degiorgi, L.; Shin, K. Y. & Fisher, I. R. Optical properties of the Ce and La ditelluride charge density wave compounds, article, February 15, 2010; United States. (digital.library.unt.edu/ark:/67531/metadc927902/m1/4/: accessed June 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.