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Transport studies at the Mott transition of the two-dimensional organic metal κ-(BEDT-TTF)2Cu[N(CN)2]Br x Cl1- x

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Abstract.

The two-dimensional organic conductor κ-(BEDT-TTF)2Cu[N(CN)2]Br x Cl1- 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.

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Authors and Affiliations

  1. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70550, Stuttgart, Germany

    S. Yasin, M. Dumm, B. Salameh & M. Dressel

  2. Hochfeld-Magnetlabor Dresden, Forschungszentrum Dresden-Rossendorf e. V., Dresden, Germany

    S. Yasin

  3. Department of Applied Physics, Tafila Technical University, Tafila, Jordan

    B. Salameh

  4. Laboratoire CIMMA, UMR 6200 CNRS-Université d’Angers, Bâtiment K, UFR Sciences, 2 Boulevard Lavoisier, 49045, Angers, France

    P. Batail & C. Meźière

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  1. S. Yasin
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Correspondence to M. Dressel.

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Yasin, S., Dumm, M., Salameh, B. et al. Transport studies at the Mott transition of the two-dimensional organic metal κ-(BEDT-TTF)2Cu[N(CN)2]Br x Cl1- x . Eur. Phys. J. B 79, 383–390 (2011). https://doi.org/10.1140/epjb/e2010-10743-2

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  • DOI: https://doi.org/10.1140/epjb/e2010-10743-2

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