Regensburg 2002 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

TT: Tiefe Temperaturen

TT 22: Postersitzung III: Syst. korr. Elektr.: Theorie II (1-15), Metall-Isol.- und Phasenüberg
änge (16-33), SL: Massivmat., Bandl., Pinning, Vortexdyn., Transport, Korngr. (34-43), Niedrigdim. Syst., Magnetotransport (44-63)

TT 22.45: Poster

Donnerstag, 14. März 2002, 14:00–17:30, A

Optical Response of the Sliding Charge Density Wave in K0.3MoO3 — •B. Gorshunov1, S. Haffner1, P. Haas1, M. Dressel1, B. Lommel2, F. Ritter2, and W. Aßmus211. Physikalisches Institut, Universität Stuttgart — 2Physikalisches Institut, Universität Frankfurt am Main

Polarized reflection spectra of one-dimensional conductor K0.3MoO3 (blue bronze) are measured along the conducting chains in the far-infrared and millimeter-wave ranges down to frequency of 2 cm−1 with and without applying a bias electric current. At temperatures below 180 K, in the CDW state, two resonances centered at 2 cm−1 and 10 cm−1 are observed, which we assign to the phason- and amplitudon-type collective excitations of the pinned CDW. If we apply a DC electric field above the threshold leading to nonlinear DC conductivity due to depinning of CDW, the optical spectra display an additional fine-structured feature at 4 cm−1, in-between the phason and the amplitudon resonances. We discuss mechanisms of coupling of sliding CDW with electromagnetic radiation which can produce resonant response in the far-infrared range, in addition to the well-known narrow band noise observed in K0.3MoO3 at radiofrequencies.

100% | Mobil-Ansicht | English Version | Kontakt/Impressum/Datenschutz
DPG-Physik > DPG-Verhandlungen > 2002 > Regensburg