한국초전도ㆍ저온공학회논문지 (Progress in Superconductivity and Cryogenics)

  • 제24권2호
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  • Pages.19-22
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  • 2022
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  • 1229-3008(pISSN)
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  • 2287-6251(eISSN)
한국초전도저온학회 (The Korean Society of Superconductivity and Cryogenics)
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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)
  • 투고 : 2022.03.22
  • 심사 : 2022.05.10
  • 발행 : 2022.06.30
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초록

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.

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과제정보

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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