Superconductivity in zigzag CuO chains

Erez Berg, Theodore H. Geballe, Steven A. Kivelson

Superconductivity has recently been discovered in Pr${}_2$Ba${}_4$Cu${}_7$O${}_{15-\delta }$ with a maximum $T_c$ of about 15K. Since the CuO planes in this material are believed to be ins…