High density of states in the pseudogap phase of the cuprate superconductor HgBa${}_2$CuO${}_{4+\delta }$

Clément Girod, Anaëlle Legros, Anne Forget +6

The specific heat $C$ of the single-layer cuprate superconductor HgBa${}_2$CuO${}_{4+\delta }$ was measured in an underdoped crystal with $T_{\mathrm{c}}=72$ K at temperatures down to $2$ K i…