한국초전도ㆍ저온공학회논문지 (Progress in Superconductivity and Cryogenics)

  • 제12권3호
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  • Pages.7-11
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  • 2010
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  • 1229-3008(pISSN)
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  • 2287-6251(eISSN)
한국초전도저온학회 (The Korean Society of Superconductivity and Cryogenics)
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STO기판에 금 나노입자가 분산된 YBCO 박막의 특성

Characteristics of $YBa_2Cu_3O_{7-x}$ Thin Films on $SrTiO_3$ substrate with surface modification by Au nanoparticles

  • 투고 : 2010.08.20
  • 심사 : 2010.09.06
  • 발행 : 2010.09.30
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초록

For many large-scale applications of high-temperature superconducting materials, large critical current density($J_c$) in high applied magnetic fields are required. A number of methods have been reported to introduce artificial pinning centers(APCs) in $YBa_2Cu_3O_{7-\delta}$(YBCO) films for enhancement of their $J_c$. In this work, we investigated electric characteristic of YBCO films on $SrTiO_3$ (100) substrates whose surfaces were modified by the introduction of Au nanoparticles (AuNPs). Au nanoparticles were uniformly dispersed on STO substrates with one of typical solution techniques, self assembled monolayer. After heating the STO substrates with Au nanoparticles, the size of Au nanoparticles was around 29~32 nm in height and 41~49 nm in diameter. XRD diffraction patterns taken on the YBCO film with Au nanoparticles show the c-axis orientation. The measured $T_c$ of YBCO /AuNPs films was around 89K and the $J_c$ was 0.75 MA/$cm^2$ at 65 K and 1 T.

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참고문헌

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