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arXiv · 1710.10668

Strain-driven attenuation of superconductivity in heteroepitaxial perovskite/YBCO/perovskite thin films

H. Zhang·A. Nguyen·T. Gredig·J. Y. T. Wei
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Abstract

To distinguish between the effects of strain and magnetism on the superconductivity in $c$-axis La$_{2/3}$Ca$_{1/3}$MnO$_3$/YBa$_2$Cu$_3$O$_{7-\delta}$ (LCMO/YBCO) heterostructures, we study perovskite/YBCO/perovskite thin films using either ferromagnetic LCMO or paramagnetic LaNiO$_3$ (LNO) as perovskite. For a lattice-symmetry matched comparison, we also use orthorhombic PrBa$_2$Cu$_3$O$_{7-\delta}$ (PBCO) in place of the pseudocubic perovskites. Unlike PBCO/YBCO/PBCO, both LCMO/YBCO/LCMO and LNO/YBCO/LNO trilayers show strong attenuation of the superconducting $T_c$ as YBCO layer thickness is reduced from 21.4 to 5.4 nm. Our results indicate that heteroepitaxial strain, rather than long-range proximity effect, is responsible for the long length scales of $T_c$ attenuation observed in $c$-axis LCMO/YBCO heterostructures.

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H. Zhang, A. Nguyen, T. Gredig, J. Y. T. Wei. 2017-10-29. Strain-driven attenuation of superconductivity in heteroepitaxial perovskite/YBCO/perovskite thin films. https://arxiv.org/abs/1710.10668

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