Berlin 2012 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 45: Correlated Electrons: Poster Session

TT 45.62: Poster

Donnerstag, 29. März 2012, 15:00–19:00, Poster B

Non-linear transport properties of pure, Rb- and W-doped blue bronze K_0.3MoO₃ — •Ali Khairi Al-Hadeethi¹, Dominik Grund¹, Song Yue², Martin Dressel², and Christine Kuntscher¹ — ¹Experimentalphysik II, Universität Augsburg, 86159 Augsburg, Germany — ²1. Physikalisches Institut, Universität Stuttgart, 70550 Stuttgart, Germany

The temperature dependence of the dc resistivity and the non-linear transport properties of pure, Rb-doped, and W-doped blue bronze K_0.3MoO₃ single crystals are presented. These are prototypical charge-density-wave (CDW) compounds. Nonlinear conductivity due to the sliding of the CDW is observed, when the applied electric field exceeds the first threshold field (E_T). Furthermore, above a second threshold field (E_T^*>E_T) coherent CDW-sliding sets in. For all studied materials E_T and E_T^* increase monotonically with decreasing temperature . This finding is discussed in terms of the incommensurate-commensurate transition of the CDW and within the frame of the Fukuyama-Lee-Rice model.