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Publication - Professor Nigel Hussey

    Gross violation of the Wiedemann-Franz law in a quasi-one-dimensional conductor


    Wakeham, N, Bangura, A, Xu, X, Mercure, J-F, Greenblatt, M & Hussey, N, 2011, ‘Gross violation of the Wiedemann-Franz law in a quasi-one-dimensional conductor’. Nature Communications, vol 2.


    When charge carriers are spatially confi ned to one dimension, conventional Fermi-liquid
    theory breaks down. In such Tomonaga – Luttinger liquids, quasiparticles are replaced by
    distinct collective excitations of spin and charge that propagate independently with different
    velocities. Although evidence for spin – charge separation exists, no bulk low-energy probe
    has yet been able to distinguish successfully between Tomonaga – Luttinger and Fermiliquid
    physics. Here we show experimentally that the ratio of the thermal and electrical
    Hall conductivities in the metallic phase of quasi-one-dimensional Li 0.9 Mo 6 O 17 diverges with
    decreasing temperature, reaching a value fi ve orders of magnitude larger than that found
    in conventional metals. Both the temperature dependence and magnitude of this ratio are
    consistent with Tomonaga – Luttinger liquid theory. Such a dramatic manifestation of spin –
    charge separation in a bulk three-dimensional solid offers a unique opportunity to explore
    how the fermionic quasiparticle picture recovers, and over what time scale, when coupling to
    a second or third dimension is restored.

    Full details in the University publications repository