Progress in Superconductivity

The Korean Superconductivity Society (한국초전도학회)
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Magnetic hysteresis loops of the polycrystalline superconductor ${SmBa_2}{Cu_3}{O_x}$

다결정 초전도체 ${SmBa_2}{Cu_3}{O_x}$의 자기 이력곡선

  • Lee J. H (Department of Physics, Pusan National University) ;
  • Jung M. S (Department of Physics, Pusan National University) ;
  • Lee B. Y (Department of Physics, Pusan National University) ;
  • Kim G. C (Department of Physics, Pusan National University) ;
  • Kim Y. C (Department of Physics, Pusan National University) ;
  • Jeong D. Y (Korea Electrotechnology Research Institute)
  • Published : 2004.10.01
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Abstract

The polycrystalline superconductor $SmBa_2$$Cu_3$$O_{x}$ is fabricated, and intergranular magnetic properties are investigated using the critical state model, from which some useful parameters such as the critical current density and the intergranular volume fraction are obtained. The curve fitting for M-H hysteresis loop shows that the intergranular critical current density of $SmBa_2$$Cu_3$$O_{x}$ / decreases in the form of ($1-T/T_{c}$ )$^{1.5}$ . The intergranular volume fraction is influenced by granular morphology. From SEM image, the grains of $SmBa_2$$Cu_3$$O_{x}$ are found to be randomly shaped. This mean:; that the intergranular volume fraction of $SmBa_2$$Cu_3$$O_{x}$ / should be smaller than those of superconductors, of which grains are plate-shaped such as Tl-based superconductor.

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