한국초전도ㆍ저온공학회논문지 (Progress in Superconductivity and Cryogenics)

  • 제6권4호
  • /
  • Pages.9-12
  • /
  • 2004
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  • 1229-3008(pISSN)
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  • 2287-6251(eISSN)
한국초전도저온학회 (The Korean Society of Superconductivity and Cryogenics)
권호 표지

Effect of oxygen pressure on properties of $NdBa_2Cu_3O_{7-{\delta}}$ films on $SrTiO_3$ (100) substrates grown by pulsed laser deposition

  • Wee, Sung-Hun (School of Materials Science & Engineering, Seoul National University) ;
  • Moon, Seung-Hyun (School of Materials Science & Engineering, Seoul National University) ;
  • Park, Chan (Applied Superconductivity Research Group, Korea E1ectrotechono1gy Research Institute) ;
  • Yoo, Sang-Im (School of Materials Science & Engineering, Seoul National University)
  • 발행 : 2004.11.01
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초록

We report a successful fabrication of high-$J_C$ $NdBa_2Cu_3O_{7-{\delta}}$ (NdBCO) films on (100) $SrTiO_3$ substrates by pulsed laser deposition (PLD) in high oxygen pressures ranging from 400 to 800 mTorr. Fabricated NdBCO films exhibited only c-axis orientation, good out-of-plane and in-plane textures, and also excellent superconducting properties, including critical temperature ($T_C$) and critical current density ($J_C$) of above 90 K and the highest of $3.1MA/cm^2$ at 77 K in self-field, implying that NdBCO is a perspective alternative to YBCO for coated conductor. In low oxygen pressures ranging from 100 to 200 mTorr, however, the films showed a-, c-mixed orientation and degraded $T_{C,zero}$ values due to the formation of $Nd_{1+x}Ba_{2-x}Cu_3O_{7-{\delta}}$-type solid solutions with an excessive substitution of $Nd^{3+}$ ions for the $Ba^{2+}$ sites.

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참고문헌

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