Berlin 2008 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

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

TT 18.12: Vortrag

Dienstag, 26. Februar 2008, 18:15–18:30, H 2053

Temperature dependence of the anomalous exponent in Li_0.9Mo₆O₁₇that reveals Luttinger Liquid behavior — Tatjana Novgorodov¹, Bernard Nansseu¹, Michael Waelsch¹, Jian He², Rongying Jin², David Mandrus^2,3, and •Rene Matzdorf¹ — ¹Universität 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 Li_0.9Mo₆O₁₇ 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.