Unprecedentedly large gap in HgBa${}_2$Ca${}_2$Cu${}_3$O${}_{8+\delta }$ with the highest $T_c$ at ambient pressure

Chuanhao Wen, Zhiyong Hou, Alireza Akbari +6

In cuprate superconductors, the highest $T_c$ is possessed by the HgBa${}_2$Ca${}_2$Cu${}_3$O${}_{8+\delta }$ (Hg-1223) system at ambient pressure, but the reason remains elusive. Here we report…