Origin of High Critical Current density in $MgB_2$ thin films

Kang, W.N.; Kim, Hyeong-Jin; Park, Eun-Mi; Kim, Mun-Seong; Kim, Kijoon H. P.

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자료유형: 학술저널

저자정보: Kang, W.N. (National Creative Research Initiative Center for Superconductivity, Department of Physics, Pohang University of Science and Technology) Kim, Hyeong-Jin (National Creative Research Initiative Center for Superconductivity, Department of Physics, Pohang University of Science and Technology) Park, Eun-Mi (National Creative Research Initiative Center for Superconductivity, Department of Physics, Pohang University of Science and Technology) Kim, Mun-Seong (National Creative Research Initiative Center for Superconductivity, Department of Physics, Pohang University of Science and Technology) Kim, Kijoon H. P. (National Creative Research Initiative Center for Superconductivity, Department of Physics, Pohang University of Science and Technology)

저널정보: 한국초전도학회 Progress in superconductivity Progress in superconductivity 제3권 제2호

발행연도: 2002.1

수록면: 135 - 139 (5page)

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2002

Origin of High Critical Current density in $MgB_2$ thin films

Kang , W.N. , Kim 외 8명 Progress in superconductivity 2002.01 학술저널

2001

Origin of High Critical Current Density in MgB$_{2}$ Thin Films

Kang , W.N. , Kim 외 9명 한국초전도학회 High Temperature Superconductivity 2001.01 학술대회자료

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We have fabricated high-quality c-axis-oriented $MgB_2$ thin films by using a pulsed laser deposition technique. The thin films grown on (1 1 0 2) $Al_2$$O_3$ substrates show an onset transition temperature of 39.2 K with a sharp transition width of ~0.15 K. X-ray diffraction patterns indicate a c-axis-oriented crystal structure perpendicular to the substrate surface. We observed high critical current densities ($J_{c}$) of ~ 16 $MA/\textrm{cm}^2$ at 15 K and under self-field, which is comparable to or exceeds those of cuprate high-temperature superconductors. The extrapolation $J_{c}$ at 5 K was estimated to be ~ 40 MA/$\textrm{cm}^2$, which is the highest record for $MgB_2$ compounds. At a magnetic field of 5 T, the $J_{c}$ of~ 0.1 $MA/\textrm{cm}^2$ was detected at 15 K, suggesting that this compound is very promising candidate for the practical applications at high temperature with lower power consumption. As a possible explanation for the high current-carving capability, the vortex-glass phase will be discussed.d.d.d.

#Mg$B_2$ #thin film #critical current density

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