Wiedemann-Franz law and abrupt change in conductivity across the pseudogap critical point of a cuprate superconductor

B. Michon, A. Ataei, P. Bourgeois-Hope +8

The thermal conductivity $\kappa$ of the cuprate superconductor La${}_{1.6-x}$Nd${}_{0.4}$Sr${}_x$CuO${}_4$ was measured down to 50 mK in seven crystals with doping from $p=0.12$ to $p=0.24$, b…