Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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High-$I_c$ single-coat YBCO films prepared by the MOD process

  • Lee, J.W. (Department of Materials Science and Engineering, Research Institute of Advanced Materials (RIAM), Seoul National University) ;
  • Shin, G.M. (Department of Materials Science and Engineering, Research Institute of Advanced Materials (RIAM), Seoul National University) ;
  • Yoo, S.I. (Department of Materials Science and Engineering, Research Institute of Advanced Materials (RIAM), Seoul National University)
  • Received : 2011.11.07
  • Accepted : 2011.11.23
  • Published : 2011.11.30
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Abstract

A single-coat $YBa_2Cu_3O_{7-{\delta}}$ (YBCO) film of high critical currents ($I_c$) could be successfully fabricated by optimizing the viscosity of the coating solution in the metal-organic deposition (MOD) process. From a Ba-deficient coating solution (Y: Ba: Cu = 1: 1.5: 3) having the viscosity of 212 $mPa{\cdot}sec$, 0.9 ${\mu}m$-thick single coat YBCO film with the $I_c$ value of 289 A/cm-width ($J_c$ = 3.2 MA/$cm^2$) at 77 K was achievable on the $SrTiO_3$ (STO) substrate, which was superior to that of our previous report for 0.8 ${\mu}m$-thick single coat YBCO film from a stoichiometric coating solution (Y: Ba: Cu = 1: 2: 3) on the $LaAlO_3$ (LAO) substrate. This result might be attributed to denser and more homogeneous microstrcuture in the case of the YBCO film from the Ba-deficient coating solution.

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References

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