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Regensburg 2010 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 11: CE: Low-dimensional Systems - Materials 2

TT 11.2: Vortrag

Dienstag, 23. März 2010, 09:45–10:00, H18

Raman scattering evidence for a cascade-like evolution of the charge-density-wave collective amplitude mode — •Hans-Martin Eiter1, Michela Lavagnini2, Leonardo Tassini1, Bernhard Muschler1, Jiun-Haw Chu3, Nancy Ru3, Ian R. Fisher3, Leonardo Degiorgi2, and Rudi Hackl11Walther Meissner Institute, Bavarian Academy of Sciences and Humanities, 85748 Garching — 2Laboratorium für Festkörperphysik, ETH - Zürich, CH-8093 Zürich, Switzerland — 3GLAM, Stanford University, CA 94304, USA

We report results of Raman scattering experiments as a function of temperature on the charge-density-wave (CDW) systems DyTe3 and on LaTe3 at 6 GPa applied pressure. We clearly identify the unidirectional collective CDW amplitude excitation and follow their temperature dependence in the range from 6 K to 311 K. Surprisingly, we discover that the amplitude mode develops as a succession of two mean-field, BCS-like transitions at two different temperatures.

Tri-tellurides with heavier rare-earth atoms (i.e. Tm, Er, Ho, Dy) undergo another phase transition to a bidirectional CDW at low temperatures. In DyTe3 we find spectroscopic evidence for the amplitude mode excitation associated with the bidirectional CDW occuring below 50 K.

This work is supported by the DFG under Grant No. Ha2071/5-1.

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