Alternate cleavage structure and electronic inhomogeneity in Ca-doped YBa${}_2$Cu${}_3$O${}_{7-\delta }$

Larissa B. Little, Jennifer Coulter, Ruizhe Kang +10

YBa${}_2$Cu${}_3$O${}_{7-\delta }$ (YBCO) has favorable macroscopic superconducting properties of $T_{\mathrm{c}}$ up to 93 K and $H_{c2}$ up to 150 T. However, its nanoscale electronic structur…