Berlin 2015 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 72: Low-Dimensional Systems: Poster Session
TT 72.4: Poster
Mittwoch, 18. März 2015, 15:00–18:00, Poster B
X-ray diffraction studies of charge-density-wave formation in DyTe3 — •Aaron Sauer1, Diego A. Zocco1, Andreas Kapuvari1, Frank Weber1, Paula Giraldo-Gallo2, Hsueh-Hui Kuo2, and Ian R. Fisher2 — 1Institute for Solid State Physics, Karlsruhe Institute of Technology, D-76021 Karlsruhe, Germany. — 2Department of Applied Physics, Stanford University, CA 94305, USA.
We report measurements of the order parameters of the charge-density-wave (CDW) states in DyTe3 using 4-circle x-ray diffraction from 5 K to 400 K. Rare-earth tritellurides (RTe3) are quasi-two-dimensional materials in which CDW order develops in the Te-Te layers. The weakly-distorted tetragonal lattice allows, for the heavier rare-earth compounds, the formation of a second CDW state at lower temperatures, orthogonal to the first one. For example, DyTe3 orders below TCDW,1 = 306 K and TCDW,2 = 49 K. The CDW order parameter is determined from the temperature evolution of the integrated intensity of the superstructure peaks. In particular, we studied how the upper CDW state is affected below TCDW,2.