Abstract
This lecture introduces the concept of the macroscopic superconducting wave function and describes how this accounts for the Meissner Effect and flux quantisation. The experimental confirmation of flux quantisation in LTC, HTC and hybrid LTC/HTC rings will be briefly discussed. Flux quantisation in the superconducting mixed state leads to the formation of the Abrikosov flux line lattice. Experiments confirming the flux line lattice in HTC superconductors by magnetic decoration and recent low angle neutron diffraction will be described. An extension of the mixed state model to granular superconductors with giant flux lines will also be briefly considered.
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