Recent neutron scattering, nuclear magnetic resonance, and scanning tunnelingmicroscopy experiments have yielded valuable new information on the interplaybetween charge and spin density wave order and superconductivity in the cupratesuperconductors, by using an applied perpendicular magnetic field to tune theground state properties. We compare the results of these experiments with thepredictions of a theory which assumed that the ordinary superconductor wasproximate to a quantum transition to a superconductor with co-existingspin/charge density wave order.
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