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Berlin 2008 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 18: Correlated Electrons: Low-dimensional Systems - Materials 2

TT 18.12: Talk

Tuesday, February 26, 2008, 18:15–18:30, H 2053

Temperature dependence of the anomalous exponent in Li0.9Mo6O17that reveals Luttinger Liquid behaviorTatjana Novgorodov1, Bernard Nansseu1, Michael Waelsch1, Jian He2, Rongying Jin2, David Mandrus2,3, and •Rene Matzdorf11Universität Kassel, Kassel, Germany — 2Oak Ridge National Laboratory, Oak Ridge, Tennessee, USA — 3The University of Tennessee, Knoxville, Tennessee, USA

Scanning tunnelling spectroscopy (STS) has been used to study the Luttinger-liquid behavior of the purple bronze Li0.9Mo6O17 in the temperature range 5K<T<300K. In the entire temperature range the suppression of density of states at the Fermi-energy could be fitted very good by a model describing the tunneling into a Luttinger liquid at ambient temperature. The power-law exponent extracted from these fits reveals a significant increase above 200K. It changes from alpha=0.6 at low temperature to alpha=1.0 at room temperature.

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