Lawlessness in low dimensions – violation of the Wiedemann-Franz law and the Pauli paramagnetic limit in quasi-one-dimensional Li0.9Mo6O17

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• Prof Nigel Hussey, U of Bristol
• Thursday 01 March 2012, 13:45-15:00
• Theory Library.

If you have a question about this talk, please contact Dr Dimitri M Gangardt.

The confinement of interacting electrons to a single dimension leads to a complete breakdown of conventional metallic (Fermi-liquid) behaviour and the emergence of a new paradigm based on collective, rather than individual, electronic excitations with independent spin and charge degrees of freedom. In this talk, I will describe our Group’s search for signatures of novel physical phenomena on the boundary of this one-dimensional paradigm, including the discovery of a gross violation of the Wiedemann-Franz law, linking the thermal and electrical conductivities, in the quasi one-dimensional purple bronze Li0.9Mo6O17 [1]. We also report a detailed magnetotransport study of the upper critical field in Li0.9Mo6O17 that hints at the possibility of triplet superconductivity [2] and discuss the possible competition between (triplet) superconductivity and density-wave formation in this fascinating compound [3].

N. Wakeham et al., Nature Communications, vol. 2, 296 (2011)

J.-F. Mercure et al., submitted (2011).

Xiaofeng Xu et al., Physical Review Letters, vol. 102, 206602 (2009).

This talk is part of the Theoretical Physics Seminars series.

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