Regensburg 2004 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 30: Postersitzung IV: Kritische Ph
änomene, Quantenstörstellen, niederdimensionale Systeme
TT 30.18: Poster
Donnerstag, 11. März 2004, 14:30–19:00, Poster A
Electrical conductivity of pure and doped K0.3MoO3 single crystals grown by various preparation methods — •S. Yue1, M. Dressel1, C. Kuntscher1, 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
We have studied the temperature dependence of the nonlinear electrical conductivity in a series of pure and doped K0.3MoO3 single crystals obtained by different preparation methods (i.e., electrochemistry and temperature-gradient flux techniques). All the pure samples reveal the resistivity anomaly near 180 K and the nonlinear transport, resulting from the Peierls transition and the sliding of the charge-density wave (CDW), respectively. Doping with Rb and W smears out the sharp transition, with the transition temperature decreased. Furthermore, the doping introduces pinning centers which enhance the threshold field for CDW depinning. We will also discuss the temperature dependence of the threshold field for the various samples.