Awana, V. P. S. and Rawat, Rajeev and Gupta, Anurag and Isobe, M. and Singh, K. P. and Vajpayee, Arpita and Kishan, H. and Takayama-Muromachi, E. and Narlikar, A. V. (2006) Physical property characterization of Fe-tube encapsulated and vacuum annealed bulk MgB2. Solid State Communications, 139 (6). 306-309. ISSN 0038-1098
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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 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.
Item Type: | Article |
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Additional Information: | Copyright for this article belongs to M/s Elsevier. |
Subjects: | Physics |
Divisions: | UNSPECIFIED |
Depositing User: | Users 27 not found. |
Date Deposited: | 11 May 2018 08:35 |
Last Modified: | 11 May 2018 08:35 |
URI: | http://npl.csircentral.net/id/eprint/2530 |
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