Vortices in superconductors

A personal view is given of important events in the research led by Joe Vinen on vortices in superconductors. The effect of electron-hole ('Andreev') scattering on transport processes, such as sound attenuation and thermal conductivity, in the mixed state is described. Theoretical work by Nozieres and Vinen on flux flow is shown still to be topical. The role of fluctuations in the transition to the normal state from the mixed state is described. These early experiments are reviewed in the light of evolving ideas about flux lattice melting which have been generated by high-T sub c research. Finally, recent observations of flux lines, using neutron and muon techniques, are linked to the work inspired by Joe Vinen. An appreciation is given of his distinctive approach to physics. Materials discussed includes niobium.