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What structural and physical differences are there that separates Nb and Pb into two different type of superconductor?

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    $\begingroup$ What separates the type II superconductor and type I superconductor is that in type II, the superconductor coherence length is shorter than the London magnetic field penetration depth. You could look at the expressions for the two length scales, and see why Niobium has a coherence length shorter than penetration depth (hyperphysics.phy-astr.gsu.edu/hbase/Solids/chrlen.html) $\endgroup$ – wcc Jun 21 '19 at 18:40

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