Dear Colleagues,
Each time I am sintering YBCO pallet, the levitation is being reduced.
More the sintering temperature, the levitation is reduced more.
Does it mean, that Levitation is lost implies that the superconductivity is lost?
Please discuss.
Thanks and Regards
N Das
Permanent magnet when placed above a superconductor, it can be levitated by this repulsive force.Levitation currents in the superconductor produce effective magnetic poles that repel and support the magnet.
Respected Preston Guynn,
Thank you for your nice discussion.
I get the idea of sintering with CO2 and O2 gas mixture .
Actually, I was sintering in O2 atmosphere.
Regards
N Das
Dear Nityananda,
The superconductivity (as zero resistivity) can persist, when the levitation is lost.
The explanation of the effect is very easy: the supercurrent can flow along a channel of a very narrow cross-sectional area (say 10-8 x 10-8 m2), whereas the Meissner effect is limited by the penetration length, which may be up to 10-7 m. So a system of narrow channels can carry supercurrent, but cannot expel the magnetic field.
The sintering can modify both the size of the SC chanels and the penetration length, so SC manifestation may vary.
Best wishes, Stanislav
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