Thermoelectricity of URu$_{2}$Si$_{2}$: giant Nernst effect in the   hidden-order state
  We present a study of Nernst and Seebeck coefficients in the heavy-fermion compound URu$_{2}$Si$_{2}$, which hosts a phase transition of unsettled origin. A giant Nernst signal of unprecedented magnitude was found to emerge in the ordered state. Moreover, our analysis of the Seebeck and Hall data indicates that the ordering leads to a sudden increase in the entropy per itinerant electron and to a drastic decrease in the scattering rate. 
Romain Bel, Hao Jin, Kamran Behnia, Jacques Flouquet and Pascal Lejay