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Physical property characterization of Fe-tube encapsulated and vacuum annealed bulk MgB2

机译:铁管封装和真空退火的块状MgB2的物理性质表征

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We report the phase formation, and present a detailed study of magnetization and resistivity under magnetic field of MgB2 polycrystalline bulk samples prepared by the Fe-tube encapsulated and vacuum (10(-5) Torr) annealed (750 degrees C) route. Zero-field-cooled magnetic susceptibility (chi(ZFC)) measurements exhibited a sharp transition to the superconducting state with a sizeable diamagnetic signal at 39 K (T-c). The measured magnetization loops of the samples, despite the presence of flux jumps, exhibited a stable current density (J(c)) of around 2.4 x 10(5) A/cm(2) in up to 2 T (Tesla) field and at temperatures (T) up to 10 K. The upper critical field is estimated from resistivity measurements in various fields and shows a typical value of 8 T at 21 K. Further, chi(FC) measurements at an applied field of 0.1 T reveal a paramagnetic Meissner effect (PME) that is briefly discussed. (c) 2006 Elsevier Ltd. All rights reserved.
机译:我们报告相的形成,并提出了磁场下的磁化和电阻率的详细研究MgB2多晶大块样品通过铁管封装和真空(10(-5)托)退火(750摄氏度)路线制备的。零场冷却的磁化率(chi(ZFC))测量显示出在39 K(T-c)处具有较大的反磁信号时会急剧过渡到超导状态。尽管存在磁通跳跃,但所测得的样品的磁化回路在高达2 T(Tesla)的磁场中仍表现出大约2.4 x 10(5)A / cm(2)的稳定电流密度(J(c))和在高达10 K的温度(T)下。根据各个领域的电阻率测量值估算出上临界场,该临界场在21 K下的典型值为8T。此外,在0.1 T的施加场下的chi(FC)测量表明,简要讨论了顺磁迈斯纳效应(PME)。 (c)2006 Elsevier Ltd.保留所有权利。

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