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

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

2006-05-29

arxiv.org/abs/cond-mat/0605689v1

Physics

Condensed Matter

Superconductivity

13 pages text + figs. accepted: solid state commun. (2006)

Scientific paper

10.1016/j.ssc.2006.05.034

We report phase formation, and detailed study of magnetization and resistivity under magnetic field of MgB2 polycrystalline bulk samples prepared by Fe-tube encapsulated and vacuum (10-5 torr) annealed (750 0C) route. Zero-field-cooled magnetic susceptibility (cZFC) measurements exhibited sharp transition to superconducting state with a sizeable diamagnetic signal at 39 K (Tc). The measured magnetization loops of the samples, despite the presence of flux jumps, exhibited a stable current density (Jc) of around 2.4 x 105 A/cm2 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, cFC measurements at an applied field of 0.1 T reveal paramagnetic Meissner effect (PME) that is briefly discussed.

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