Vajpayee, Arpita and Awana, V. P. S. and Kishan, H. and Narlikar, A. V. and Bhalla, G. L. and Wang, X. L.
(2008)
High field performance of nanodiamond doped MgB2 superconductor.
Journal of Applied Physics .
pp. 1-3.
ISSN 0021-8979
Abstract
The results from magnetotransport and magnetization of nanodiamond doped MgB2-nDx are
reported. Superconducting transition temperature �Tc� is not affected significantly by x up to x
=0.05 and latter decreases slightly for higher x�0.05. R�T� vs H measurements show higher Tc
values under same applied magnetic fields for the nanodiamond added samples, resulting in higher
estimated Hc2 values. From the magnetization measurements, it was found that irreversibility field
value Hirr for the pristine sample is 7.5 T at 4 K and the same is increased to 13.5 T for 3 wt % nD
added sample at the same temperature. The Jc�H� plots at all temperatures show that Jc value is
lowest at all applied fields for pristine MgB2 and the sample doped with 3 wt % nD gives the best
Jc values at all fields. These results are discussed in terms of extrinsic pinning due to dispersed
n-diamond in the host MgB2 matrix along with the intrinsic pinning due to possible substitution of
C at boron site and increased interband scattering for highly doped samples resulting in
extraordinary performance of the doped system.
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