Coherently strained epitaxial YBa$_2$Cu$_3$O$_{7-δ}$ films grown on NdGaO$_3$ (110)

Sogol Khanof; Jochen Mannhart; Hans Boschker

doi:10.1063/1.5037540

paper

Coherently strained epitaxial YBa $_{2}$ Cu $_{3}$ O $_{7 - δ}$ films grown on NdGaO $_{3}$ (110)

arXiv:1806.11375 · doi:10.1063/1.5037540

Abstract

YBa $_{2}$ Cu $_{3}$ O $_{7 - δ}$ is a good candidate to systematically study high-temperature superconductivity by nanoengineering using advanced epitaxy. An essential prerequisite for these studies are coherently strained YBa $_{2}$ Cu $_{3}$ O $_{7 - δ}$ thin films, which we present here using NdGaO $_{3}$ (110) as a substrate. The films are coherent up to at least 100 nm thickness and have a critical temperature of 89 $\pm$ 1 K. The $a$ and $b$ lattice parameters of the YBa $_{2}$ Cu $_{3}$ O $_{7 - δ}$ are matched to the in-plane lattice parameters of NdGaO $_{3}$ (110), resulting in a large reduction of the orthorhombicity of the YBa $_{2}$ Cu $_{3}$ O $_{7 - δ}$ . These results imply that a large amount of structural disorder in the chain layers of YBa $_{2}$ Cu $_{3}$ O $_{7 - δ}$ is not detrimental to superconductivity.

Accepted for publication in Applied Physics Letters

Coherently strained epitaxial YBa2​Cu3​O7−δ​ films grown on NdGaO3​ (110)

Abstract

Coherently strained epitaxial YBa $_{2}$ Cu $_{3}$ O $_{7 - δ}$ films grown on NdGaO $_{3}$ (110)