Enhancing superconductivity of ultrathin YBa2Cu3O7-δ films by capping non-superconducting oxides

Enhancing superconductivity of ultrathin YBa₂Cu₃O_7-δ films by capping non-superconducting oxides

Bo Hai¹, Ren Tianshuang¹, Chen Zheng¹, Zhang Meng¹, Xie Yanwu^{1, 2, †}

The dependence of resistance on temperature of PBCO (∼7 nm)-capped YBCO thin films of different thicknesses. The inset shows the onset of T_c, determined as the position of the maximum of the derivative curve, d R ( T ) / d T , for the PBCO-capped YBCO thin films. The postannealing time for all samples is 30 minutes. The “10-uc uncapped” sample (dashed line) is regenerated from Fig. 2 for comparison.