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TT: Fachverband Tiefe Temperaturen

TT 22: Correlated Electrons: Low-dimensional Systems - Materials 1

TT 22.8: Vortrag

Mittwoch, 28. März 2012, 11:30–11:45, H 0104

Charge density wave formation in ErTe₃ — •Hans-Martin Eiter¹, Michela Lavagnini¹, Rudi Hackl¹, E. A. Nowadnick^2,3, A. F. Kemper^2,3, Thomas P. Devereaux^2,3, J.-H. Chu^2,3, J. G. Analytis^2,3, Ian R. Fisher^2,3, and Leonardo Degiorgi⁴ — ¹Walther-Meissner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany — ²Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA — ³Geballe Laboratory for Advanced Materials & Dept. of Applied Physics, Stanford University, CA 94305, USA — ⁴Laboratorium für Festkörperphysik, ETH - Zürich, CH-8093 Zürich, Switzerland

Rare-earth tritellurides are model systems to study low dimensional interacting electron gases. ErTe₃ undergoes two charge density wave (CDW) phase transitions at 265 K and 155 K at ambient pressure. External pressure can suppress both CDW transitions completely. Using Raman scattering, it is possible to detect the signature of both CDW energy gaps as well as the corresponding collective amplitude mode excitations. This allows us to map out the high pressure phase diagram. We also provide calculations on the basis of the electronic band structure which allow us to understand the selection rules as well as the spectra in a semi-quantitatively fashion.
This work is supported by the DFG under Grant No. Ha2071/5.