Abstract
YBa2Cu3O7−δ is a good candidate to systematically study high-temperature superconductivity by nanoengineering using advanced epitaxy. An essential prerequisite for these studies is coherently strained YBa2Cu3O7−δ thin films, which we present here using NdGaO3 (110) as a substrate. The films are coherent up to at least 100 nm thickness and have a critical temperature of 89 ± 1 K. The a and b lattice parameters of YBa2Cu3O7−δ are matched to the in-plane lattice parameters of NdGaO3 (110), resulting in a large reduction of the orthorhombicity of YBa2Cu3O7−δ. These results imply that a large amount of structural disorder in the chain layers of YBa2Cu3O7−δ is not detrimental to superconductivity.
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