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The development of high-pressure technology has opened up detailed studies into the interplay between superconductivity and magnetism. Top panel: the diamond anvil used in heavy-fermion investigations at Geneva and Grenoble can produce pressures up to 10 GPa.
Bottom panel: meanwhile, the magnetic behaviour of iron up to 100 GPa has been studied in Osaka. In both cases the resistivity measurements are made with the help of tiny gold-wire connections.