Dresden 2011 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 44: Poster Session Correlated Electrons
TT 44.58: Poster
Thursday, March 17, 2011, 10:00–13:00, P1
Doping effects on the non-linear transport in blue bronze — •Ali Al-Hadeethi1, Duminik Grund1, Song Yue2, Martin Dressel2, and Christine Kuntscher1 — 1Experimentalphysik II, Universität Augsburg, 86159 Augsburg, Germany — 2Physikalisches Institut, Universität Stuttgart, 70550 Stuttgart, Germany
When low-dimensional metals are cooled, they often undergo a phase transition to an insulating state exhibiting a new type of order. A famous example is the blue bronze K0.3MoO3, which undergoes a Peierls transition at TP≈180 K to a charge-density-wave (CDW) state. In this work, the temperature dependence of the dc resistivity and the non-linear transport properties in pure, Rb-doped, and W-doped blue bronze single crystals is presented. Our measurements show that substituting K by Rb and Mo by W shifts TP to lower values and smears out the metal-insulator transition. At temperatures below TP nonlinear conductivity due to charge transport by the CDW is observed, when the applied electric field exceeds the so-called first threshold field. The temperature dependence of the first threshold field is presented for all studied samples. Furthermore, the temperature dependence of the second threshold field, which is usually attributed to the onset of coherent CDW sliding, is discussed.