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
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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