### The second Wien effect: non-linear response of Coulomb systems from electrolytes to frustrated magnets

Fluids and Materials Seminar

7th March 2018, 2:00 pm – 3:00 pm

Physics, 3.34

Electric field can increase conductivity of electrolytes by liberating ions that are electrostatically paired in equilibrium. Despite this so-called second Wien effect being beyond linear response, Onsager gave its exact solution on the two-ion level. I will show how Monte Carlo simulations of lattice electrolytes help uncover many-body corrections to Onsager's solution [1]. I will then focus on applications of the second Wien effect to spin ice, one of the many of materials where it occurs. Spin ice is a three-dimensional frustrated magnet with quasiparticles that carry topological and magnetic charge -- magnetic monopoles -- that can be collectively seen as a magnetic electrolyte. The second Wien effect can then be applied to predict is non-linear non-equilibrium response [2].

[1] V. Kaiser, et al., Nat. Materials 12 1033-1037 (2013).

[2] V. Kaiser et al., Phys. Rev. Lett. 115 037201 (2015).

*Organiser*: Rachel Bennett

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