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Journal of Material Sciences
ISSN: 2321-6212
I n t e r n a t i o n a l C o n f e r e n c e o n
Metal, Mining and
Magnetic Materials
N o v e m b e r 0 1 - 0 2 , 2 0 1 8
P a r i s , F r a n c e
Metal and Magnetism 2018
An overview of superconductivity of MgB2: critical current
density, pinning mechanisms, scaling law and levitation force
Dinesh Tripathi
1
and T K Dey
2
1
Jaypee Institute of Information Technology, Noida, India
2
Cryogenic Engineering Centre-Indian Institute of Technology Kharagpur, India
E
nergy conservation and related environmental issues inevitably are the most serious problem of the 21
st
century.
Superconductive technology is therefore, probably the ultimate and environment friendly technology for energy saving with its
impact on almost all the aspects in our daily life. Large scale superconductive devices for power industry depend on conductors
with high critical current densities at temperatures where the cost of coolant is affordable. High temperature superconductors
(HTSCs), inter-metallic compound superconductor (MgB
2
) and recently discovered pnictides (FeAs) are the ideal candidates for
such applications. Although great progresses have been achieved since the discovery of HTSC, they could not be employed yet
for large scale applications due to anisotropy and its high cost. Further, the presence of toxic arsenic and unstandardized wires/
tapes fabrication techniques limits the applications of pnictides. Due to transparent grain boundaries, lower anisotropy, large
coherence length, reasonably good critical current density (
JC
), easy processing and low cost, MgB
2
has been the challenge for
the domination of HTSC since the last one decade at LH2 temperature. However, the compound is far from being the perfect
choice and still needs substantial improvement in its
JC
,
HC
2
etc. to become competitive. Fortunately, the structure of MgB
2
allows the control and improvement of
HC
2
and JC by appropriate chemical doping. This has led to a race for increasing
J
C and
drive it closer and closer to the depairing current density (
Jd
). However, a sufficiently high Jd does not guarantee a high
JC
for the
superconductor to be useful for engineering applications and hence one need to tailor the defect structure of the superconductors
to maximize flux pinning force (
FP
). In the present talk, instead of highlighting our work on improving
JC
of MgB
2
superconductor
through inorganic and organic materials doping, emphasis has been given to understand and identify the pinning mechanisms,
scaling law and levitation force of MgB
2
based superconductors.
dineshazm83@gmail.com dinesh.tripathi@jiit.ac.inJ Mat. Sci. 2018, Volume:6
DOI: 10.4172/2321-6212-C7-033