Berlin 2005 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 16: Posters Correlated Electrons, Measuring Devices, Cryotechnique

TT 16.55: Poster

Samstag, 5. März 2005, 11:00–16:30, Poster TU C

Doping effects on the electrical properties of blue bronze K_0.3MoO₃ — •S Yue¹, C. A Kuntscher¹, M Dressel¹, S van Smaalen², F Ritter³, and W Aßmus³ — ¹1. Physikalisches Institut, Universität Stuttgart, 70550 Stuttgart, Germany — ²Laboratory of Crystallography, University of Bayreuth, 95440 Bayreuth, Germany — ³Physikalisches Institut, Universität Frankfurt, 60054 Frankfurt, Germany

The temperature dependence of the dc resistivity and the nonlinear transport properties in pure, rubidium-, and tungsten-doped blue bronze K_0.3MoO₃ single crystals are presented. In comparison with the rubidium doping, the tungsten doping has larger effects on the electrical transport properties and the Peierls transition. In particular, the peak in the threshold field for nonlinear transport, observed in the pure and rubidium-doped samples around 100 K, is absent in tungsten-doped K_0.3MoO₃. These results are discussed with respect to the proposed incommensurate-commensurate transition of the charge-density-wave and its interaction with impurities. Supported by the DFG, SPP 1073.