Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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Nonlocality effects of MgB2 superconductor

  • Jeong Hun Yang (Div. of Science Education and Institute of Sci. Education, Jeonbuk National University) ;
  • Jong Su You (Div. of Science Education and Institute of Sci. Education, Jeonbuk National University) ;
  • Soo Kyung Lee (Div. of Science Education and Institute of Sci. Education, Jeonbuk National University) ;
  • Kyu Jeong Song (Div. of Science Education and Institute of Sci. Education, Jeonbuk National University)
  • Received : 2023.08.28
  • Accepted : 2023.09.28
  • Published : 2023.09.30
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Abstract

Magnetic properties of MgB2 superconducting powder were investigated. M(H), the magnetic field H dependence of magnetization M, was measured and analyzed using a PPMS instrument. The MgB2 superconducting powder showed high critical current density Jc > ~ 107 A/cm2 and clean limit superconducting properties. The equilibrium magnetization Meq properties of MgB2 powders exhibiting various superconducting properties were studied. We find that the equilibrium magnetization Meq(H) properties of MgB2 powders showing conventional BCS properties deviate from the predictions of the standard local-London theory at temperatures below T = 19 K and are in good agreement with the generalized nonlocal-London theory. Nonlocal-London analysis was used to determine and analyze the nonlocal parameters. The temperature dependence of the London penetration depth values λ(T) was studied.

Keywords

Acknowledgement

This work was supported by a grant from the Basic Science Research Program, administered through the National Research Foundation of Korea (NRF) and funded by the Ministry of Education (NRF-2021R1A2C1094771).

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