Irreversibility temperature in superconductors

peterjaybee
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Hello, I would be grateful is someone could explain what the irreversibly temperature in type II superconductors is.

I have just done some NMR experiments on MgB2 and get a lineshape change at the the irreversibility temperature as opposed to the field corrected Tc, so I believe it has something to do with the flux lattice formation.

Regards,

Peter
 
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