Abstract
We report the phase formation, and present a detailed study of magnetization and resistivity under magnetic field of MgB 2 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 2.4×10 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, χ FC measurements at an applied field of 0.1 T reveal a paramagnetic Meissner effect (PME) that is briefly discussed.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
