We have taken bolometric infrared spectra of the charge-density-wave conductor orthorhombic TaS3, doped with niobium and titanium. For transverse polarization, the bolometric signal is roughly proportional to the absorptivity. Niobium doping (∼200 ppm) greatly increases the charge-density-wave depinning field and broadens the Peierls transition, while Ti doping (∼ 10 ppm) has negligible effect. Nevertheless, both types of samples have similar spectra: a large decrease of absorption above the Peierls gap (i.e. smearing of the absorption threshold) and no significant increase in absorption below the gap. The "midgap" absorption line at 500 cm-1 is not affected by doping. Results are discussed in terms of the model of Tutto and Zawadowski.
|Number of pages||4|
|Journal||Solid State Communications|
|State||Published - Mar 1988|
Bibliographical noteFunding Information:
"Acknowledgements"-Wea ppreciate useful conversations with Dr. A. Zawadowski, the technical assistance of M.-Y. Chung, and the aid of 8. Jones and J. Kuhn of the Kentucky Energy Cabinet Laboratory in performing the Plasma mission Analysis. This research was funded in part by the National Science Foundation--Solid State Physics, Grant NumberD MR-8615463.
Copyright 2014 Elsevier B.V., All rights reserved.
ASJC Scopus subject areas
- Chemistry (all)
- Condensed Matter Physics
- Materials Chemistry