Abstract
The superconducting properties of ultrathin c-axis-oriented YBa2Cu3O7−δ(YBCO) layers can be significantly enhanced by use of more conductive buffer and cap layers. In particular, Pr0.5Ca0.5Ba2Cu3O7−δ/YBCO/Pr0.5Ca0.5Ba5 Cu3O7−δ trilayer structures, with YBCO layer thickness as small as 1 unit cell, have superior transport properties to PrBa2Cu3O7−δ/YBCO/PrBa2Cu3O7−δ structures, including an increase in Tc and a narrower superconducting transition. The enhanced superconducting properties that result from using Ca-(hole) doped buffer and cap layers may be a result of a diminished perturbation of the order parameter at growth-related steps in the electrical continuity of the YBCO layer.
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