Berlin 2012 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 22: Correlated Electrons: Low-dimensional Systems - Materials 1
TT 22.8: Talk
Wednesday, March 28, 2012, 11:30–11:45, H 0104
Charge density wave formation in ErTe3 — •Hans-Martin Eiter1, Michela Lavagnini1, Rudi Hackl1, E. A. Nowadnick2,3, A. F. Kemper2,3, Thomas P. Devereaux2,3, J.-H. Chu2,3, J. G. Analytis2,3, Ian R. Fisher2,3, 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.