Journal of Magnetics

  • 제16권1호
  • /
  • Pages.15-18
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  • 2011
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  • 1226-1750(pISSN)
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  • 2233-6656(eISSN)
한국자기학회 (The Korean Magnetics Society)
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TiO2 Nano-doping Effect on Flux Pinning and Critical Current Density in an MgB2 Superconductor

  • Kang, J.H. (Department of Nano and Electronic Physics, Kookmin University) ;
  • Park, J.S. (Quantum Photonic Research Center and Department of Physics, Hanyang University) ;
  • Lee, Y.P. (Quantum Photonic Research Center and Department of Physics, Hanyang University) ;
  • Prokhorov, V.G. (Institute of Metal Physics, National Academy of Sciences of Ukraine)
  • 투고 : 2010.08.24
  • 심사 : 2010.12.20
  • 발행 : 2011.03.31
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초록

We have studied the $TiO_2$ doping effects on the flux pinning behavior of an $MgB_2$ superconductor synthesized by the in-situ solid-state reaction. From the field-cooled and zero-field-cooled temperature dependences of magnetization, the reversible-irreversible transition of $TiO_2$-doped $MgB_2$ was determined in the H-T diagram (the temperature dependence of upper critical magnetic field and irreversibility line). For comparison, the similar measurements are also obtained from SiC-doped $MgB_2$. The critical current density was estimated from the width of hysteresis loops in the framework of Bean's model at different temperatures. The obtained results manifest that nano-scale $TiO_2$ inclusions served as effective pinning centers and lead to the enhanced upper critical field and critical current density. It was concluded that the grain boundary pinning mechanism was realized in a $TiO_2$-doped $MgB_2$ superconductor.

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참고문헌

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