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TT: Fachverband Tiefe Temperaturen

TT 27: CE: Poster Session

TT 27.3: Poster

Mittwoch, 24. März 2010, 14:00–18:00, Poster D1

Energy gap in charge-density-wave systems — •Reinhard Rossner¹, Hans-Martin Eiter¹, Michela Lavagnini², Leonardo Tassini¹, Bernhard Muschler¹, Jiun-Haw Chu³, Nancy Ru³, Ian R. Fisher³, Leonardo Degiorgi², and Rudi Hackl¹ — ¹Walther Meissner Institute, Bavarian Academy of Sciences and Humanities, D-85748 Garching, Germany — ²Laboratorium für Festkörperphysik, ETH - Zürich, CH-8093 Zürich, Switzerland — ³GLAM, Stanford University, Stanford, California 94305, USA

The rare-earth tri-tellurides show a phase transition to a charge-density-wave ground state, some of them at temperatures well above 300 K. As a consequence an energy gap Δ opens up. We observed this gap in DyTe₃ and LaTe₃ by measuring the electronic Raman effect as a function of polarization in the temperature range from 6 K to 311 K. The gap becomes more pronounced with decreasing temperature. The magnitudes of Δ are in agreement with those obtained by other experimental techniques such as angle-resolved photoemission spectroscopy. The polarization dependence allows us to study the anisotropy of the gap.