Transport studies at the Mott transition of the two-dimensional organic metal κ-(BEDT-TTF) 2 Cu[N(CN) 2 ]Br x Cl 1- x

S. Yasin, M. Dumm, B. Salameh, P. Batail, C. Meźière and M. Dressel ()

The European Physical Journal B: Condensed Matter and Complex Systems, 2011, vol. 79, issue 4, 383-390

Abstract: The two-dimensional organic conductor κ-(BEDT-TTF) 2 Cu[N(CN) 2 ]Br x Cl 1- x undergoes a transition from an insulator to a superconductor upon substituting Cl by Br. We have performed in- and out-of-plane electric-transport measurements on the alloyed series with x=20%, 40%, 70%, 80%, 85%, and 90% as a function of temperature in order to explore the bandwidth-controlled phase transition between the Mott insulator and the Fermi-liquid. All crystals exhibit a similar semiconducting behavior of ρ(T) from room temperature down to 100 K. Below approximately 50 K, a metal-to-insulator transition is found for compounds with x > 70%. Out of this Mott insulating state, magnetic order develops below T N ≈ 25 K. The Br-rich samples cross a bad-metal regime before they become coherent metals and eventually superconducting at T c ≈ 12 K. For these systems the resistivity at T c ≤ T ≤ T 0 reveals a ρ(T) ∝ T 2 dependence associated with a strongly correlated Fermi-liquid, limited by some characteristic temperature T 0 . The conclusions are corroborated by data from microwave, magnetic and optical experiments. Copyright EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2011

Date: 2011
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DOI: 10.1140/epjb/e2010-10743-2

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