한국초전도ㆍ저온공학회논문지 (Progress in Superconductivity and Cryogenics)

  • 제25권3호
  • /
  • Pages.28-33
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  • 2023
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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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The magnetic relaxation of MgB2 powder

  • 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)
  • 투고 : 2023.08.28
  • 심사 : 2023.09.29
  • 발행 : 2023.09.30
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초록

Magnetic relaxation properties of pure MgB2 powder samples and diluted water-treated MgB2 powder samples were investigated. The magnetic field H-dependence, m(H), and the time t-dependence, m(t), of the magnetic moment m were measured and analyzed using the PPMS-VSM magnetometer equipment, respectively. The m(t) reduction rates of pure MgB2 powder samples and diluted water-treated MgB2 powder samples decreased to about 0.7 ~ 1.8% and 0.6 ~ 1.0% for about 7200 s, respectively, at temperature T = 15 K. The magnetic relaxation properties of the two types of MgB2 powders were analyzed by calculating the magnetic relaxation rate S = -dln(Mirr)/dln(t) values according to Anderson-Kim theory. The magnetic relaxation ratio S values of the two types of MgB2 powder samples were almost similar. As a result of the quantum creep effect, the constant magnetic relaxation rate S characteristic was confirmed at a temperature range of T = 10 K or less.

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과제정보

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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