Progress in Superconductivity

한국초전도학회 (The Korean Superconductivity Society)
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가열냉각 온도에 따른 $MgB_2$ 박막의 특성변화

Effects of the post-annealing temperature on the properties of $MgB_2$ thin films ­

  • Hyeong-Jin Kim (National Creative Research Initiative Center for Superconductivity, Department of Physics, Pohang University of Science and Technology) ;
  • W. N. Kang (National Creative Research Initiative Center for Superconductivity, Department of Physics, Pohang University of Science and Technology) ;
  • Eun-Mi Choi (National Creative Research Initiative Center for Superconductivity, Department of Physics, Pohang University of Science and Technology) ;
  • Sung-Ik Lee (National Creative Research Initiative Center for Superconductivity, Department of Physics, Pohang University of Science and Technology)
  • 발행 : 2001.01.01
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초록

We have fabricated $MgB_2$thin films on (1 1 02)$ A1_2$$O_3$substrates by using a two-step method. Amorphous B thin films were deposited by a pulsed laser deposition technique and sintered in Mg vapor at various temperatures from 800 to $950^{\circ}C$. Superconducting properties of the thin films were investigated by temperature dependences of magnetization and critical current density. Structural studies were carried out by an x-ray diffraction and a scanning electron microscope. The films fabricated at $900^{\circ}C$ showed the highest transition temperature of 39 K and critical current density of ~$10^{7}$ A/$\textrm{cm}^2$ at 15 K.

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