Question

How to determine if a superconductor is type I or II?

Answer 1

Whether a superconductor is type I or type II is determined by the ratio of the london penetration depth (λλ) to the superconducting coherence length (ξξ). If κ=λ/ξ<1/2–√κ=λ/ξ<1/2, the superconductor is type I. Otherwise, it is type II.

The superconducting coherence length can be viewed either as the physical 'size' of a Cooper pair or the 'healing length' over which superconductivity recovers after it is perturbed. The London penetration depth is the length over which magnetic fields are allowed to penetrate into a superconductor and also the skin depth through which supercurrents flow to screen a magnetic field. Both quantities vary between several nanometers and several microns depending on the specific material.

The most direct way to figure out if a superconductor is type I or type to is to measure both ξξ and λλ and look at their ratio.

I previously discussed how to measure ξξ (usually from upper critical magnetic field: the magnetic field required to kill superconductivity)
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Answer 2

Whether a superconductor is type I or type II is determined by the ratio of the london penetration depth () to the superconducting coherence length (). ...

The most direct way to figure out if a superconductor is type I or type to is to measure both and and look at their ratio.