Progress in Superconductivity

The Korean Superconductivity Society (한국초전도학회)
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The Formation of $YBa_2$$Cu_3$$O_7$ Step-edge Josephson Junction on LaAl$O_3$and MgO Single Crystal Substrates by Using Step-edge Annealing

LaAl$O_3$와 MgO 기판 위에 형성한 $YBa_2$$Cu_3$$O_7$ 모서리 죠셉슨 접합의 열처리 효과

  • Yunseok Hwang (Korea Research Institute of Standards and Science, Korea University) ;
  • Kim, Jin-Tae (Korea Research Institute of Standards and Science) ;
  • Sunkyung Moon (Korea Research Institute of Standards and Science, Korea University) ;
  • Lee, Soon-Gul (Korea University) ;
  • Park, Yong-Ki (Korea Research Institute of Standards and Science) ;
  • Park, Jong-Chul (Korea Research Institute of Standards and Science)
  • 황윤석 ;
  • 김진태 ;
  • 문선경 ;
  • 이순걸 ;
  • 박용기 ;
  • 박종철
  • Published : 2001.01.01
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Abstract

The effect of annealing step-edges of LaAlO$_3$ and MgO single crystal substrates on YBa$_2$Cu$_3$O$_{7}$ junction has been studied. The step-edge was fabricated by argon ion milling and was annealed at 105$0^{\circ}C$ in 1 attn oxygen pressure. We compared AFM image near step-edge of the substrates between before and after annealing process. And YBa$_2$Cu$_3$O$_{7}$ thin film was deposited on the step-edge by a standard pulsed laser deposition. The step-edge junctions were characterized by current-voltage curves at 77 K. The annealing of step-edges of MgO substrate improved the current-voltage characteristic of Josephson junction: double steps in the current-voltage characteristic disappeared. However the annealing for LaAlO$_3$ did not improve the junction property.rty.

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