Effect of La1−xSrxMnO3 (x = 0.2, 0.3, 0.5) buffer layer on the superconducting properties of GdBa2Cu3O7−δ

다국어 초록 (Multilingual Abstract)

We fabricated epitaxial La1−xSrxMnO3 (LSMO) thin flms on a (001) SrTiO3 (STO) substrate via pulsed laser deposition by varying the Sr doping contents. We used several characterization techniques to investigate the structural, magnetic, and electronic transport properties of the epitaxial LSMO and evaluate its applicability as a bufer layer for GdBa2Cu3O7−δ (GdBCO) superconducting flms. The structural analysis indicated that the best lattice match with the STO substrate was obtained in LSMO with x=0.2, and the lattice constant decreased as the Sr content increased. We found that the magnetic properties of the LSMO were governed by the Mn ion proportion, and LSMO with x=0.3 exhibited the strongest ferromagnetism because it had the highest ratio of Mn3+. The electronic transport properties, including the metal–insulator transition temperature, depended signifcantly on the Sr content. A GdBCO flm on top of LSMO (x=0.3) exhibited the best superconducting properties, probably owing to strong ferromagnetism and good metallic behavior of LSMO as well as the optimal Cu–O bond length. The results of this study may serve as a reference for investigating the development of LSMO bufer layers for high-temperature superconductor cuprates.

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