YBa2Cu3O7-δ (YBCO) films with nominal thicknesses of 1-4 unit cells were grown by pulsed laser deposition using (PrxY1-x)Ba2Cu3O 7-δ [(PrxY1-x)BCO] (1≥x≥0) as buffer layers and cap layers. The films of 1 unit cell thick were superconducting for all the x values while Tc increased when x was reduced. For adjacent layers of (Pr0.6Y0.4)BCO which is semiconducting, a Tc of 43 K and Jc of 2×10 6 A/cm2 for B∥ab and 4×105 A/cm 2 for B⊥ab at B=7 T and 4.2 K were obtained in a one-unit cell thick YBCO layer. The Jc values of a few unit cell thick YBCO layers nearly approached that of thick YBCO films. The results suggest the absence of significant weak-link effects in these films.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)