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http://dx.doi.org/10.9714/psac.2022.24.2.019

Effect of competition between superconductivity and ferromagnetism in GdBa2Cu3O7-x/La0.7Sr0.3MnO3 bilayers  

Oh, Jun-Yung (Department of Physics, Research Institute for Nanoscale Science and Technology, Chungbuk National University)
Yang, Dong-Seok (Department of Physics Education, Chungbuk National University)
Kang, Byeongwon (Department of Physics, Research Institute for Nanoscale Science and Technology, Chungbuk National University)
Publication Information
Progress in Superconductivity and Cryogenics / v.24, no.2, 2022 , pp. 19-22 More about this Journal
Abstract
We studied the effect of substrate-induced strain state on the superconducting transition in GdBa2Cu3O7-x(GdBCO)/La0.7Sr0.3MnO3 (LSMO) bilayers deposited on a LaAlO3 (LAO) substrate. The stain state of LSMO is controlled by increasing the thickness from 20 nm to 80 nm. Analyses on the extended X-ray absorption fine structure (EXAFS) measurements reveal difference in the direction of MnO6 octahedral distortion depending on the LSMO thickness, which leads to a difference in anisotropy of magnetization of LSMO layer. The superconducting transitions of our system are strongly correlated with the magnetic anisotropy accompanied by the MnO6 octahedron distortion in a specific direction. This result suggests the possibility of improving the superconducting transition in the GdBCO/LSMO bilayer system by controlling the degree of competition between superconductivity and ferromagnetism via adjusting strain state in the LSMO layer.
Keywords
GdBCO; LSMO; superconducting transition; magnetic anisotropy; local structure;
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