Abstract
Substrate-induced epitaxial strain plays a crucial role in the physical properties of cuprate thin films; therefore, it is essential to control the epitaxial strain. In this work, we studied the effect of a La0.7Sr0.3MnO3 (LSMO) buffer layer on the epitaxial strain experienced by GdBa2Cu3O7−x (GdBCO) thin films deposited on a LaAlO3 (LAO) substrate. This was accomplished by varying the thickness of the LSMO buffer layer, which was inserted between the GdBCO and LAO to control the substrate-induced epitaxial strain, from 20 to 80 nm. It was found that the direction of MnO6 octahedral distortion in the LSMO layer was changed by the substrate-induced strain and it causes a difference on the local structure and the superconducting properties of the GdBCO/LSMO bilayer, confirming local structural coupling between the LSMO buffer and the GdBCO. The superconducting transition temperature (Tc) of GdBCO can be enhanced by adequately relaxing the strain state of the CuO2 plane. This finding suggests the possibility of actively enhancing the superconductivity by controlling the substrate-induced strain state by suitably adjusting the LSMO layer.
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The datasets generated during and/or analyzed during the current study are not publicly available due to that the data also form part of an ongoing study, but are available from the corresponding author on reasonable request.
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Funding
This work was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF), funded by the Ministry of Education (2021R1I1A3044518).
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JYO: conceptualization, formal analysis and investigation, writing—original draft; YJK: investigation; DSY: methodology; WJ: resources; BK: conceptualization, writing—review and editing, supervision, funding acquisition.
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Oh, JY., Ko, YJ., Yang, DS. et al. Strain engineering using La0.7Sr0.3MnO3 buffer layer for enhancing superconductivity in GdBa2Cu3O7−x films. J Mater Sci: Mater Electron 33, 15272–15282 (2022). https://doi.org/10.1007/s10854-022-08453-w
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DOI: https://doi.org/10.1007/s10854-022-08453-w