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http://dx.doi.org/10.9714/psac.2010.12.3.007

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

Oh, Se-Kweon (충북대학교 신소재공학과)
Jang, Gun-Eik (충북대학교 신소재공학과)
Tran, Hai Duc (충북대학교 물리학과)
Kang, Byoung-Won (충북대학교 물리학과)
Lee, Cho-Yeon (한국표준과학연구원)
Hyun, Ok-Bae (전력연구원)
Publication Information
Progress in Superconductivity and Cryogenics / v.12, no.3, 2010 , pp. 7-11 More about this Journal
Abstract
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.
Keywords
YBCO; Self-assmebled monolayer; flux pinning; Au nanoparticle;
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