Title of article
Physical property characterization of Fe-tube encapsulated and vacuum annealed bulk MgB2
Author/Authors
Awana، نويسنده , , V.P.S. and Rawat، نويسنده , , Rajeev and Gupta، نويسنده , , Anurag and Isobe، نويسنده , , M. and Singh، نويسنده , , K.P. and Vajpayee، نويسنده , , Arpita and Kishan، نويسنده , , H. and Takayama-Muromachi، نويسنده , , E. and Narlikar، نويسنده , , A.V.، نويسنده ,
Issue Information
روزنامه با شماره پیاپی سال 2006
Pages
4
From page
306
To page
309
Abstract
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 ∘C) route. Zero-field-cooled magnetic susceptibility ( χ 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 2.4×105 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, χ FC measurements at an applied field of 0.1 T reveal a paramagnetic Meissner effect (PME) that is briefly discussed.
Keywords
D. Superconductivity , D. Low density MgB2 , D. Magnetization
Journal title
Solid State Communications
Serial Year
2006
Journal title
Solid State Communications
Record number
1790974
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