Magnetic fluctuations and specific heat in NaxCoO2 near a Lifshitz topological transition

Sergey Slizovskiy, Andrey V. Chubukov, Joseph J. Betouras

We analyze the temperature and doping dependence of the specific heat $C(T)$ in Na${}_x$CoO${}_2$. This material was conjectured to undergo a Lifshitz -type topological transition at $…