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In high-quality c-axis-oriented MgB2 thin films, we observed high criticalcurrent densities (Jc) of 16 MA/cm^2 at 15 K under self fields comparable tothose of cuprate high-temperature superconductors. The extrapolated value of Jcat 5 K was estimated to be 40 MA/cm^2. For a magnetic field of 5 T, a Jc of 0.1MA/cm^2 was detected at 15 K, suggesting that this compound would be a verypromising candidate for practical applications at high temperature and lowerpower consumption. The vortex-glass phase is considered to be a possibleexplanation for the observed high current-carrying capability.Comment: 3 pages and 4 figures, to be published in Physical Review Letter

physical review letters

High Current-Carrying Capability in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">c</mml:mi></mml:math>-Axis-Oriented Superconducting<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>MgB</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>Thin Films

High Current-Carrying Capability inc-Axis-Oriented SuperconductingMgB2Thin Films