Abstract
I review recent theoretical calculations and experimental measurements which demonstrate that the planar excitations in the normal state of the superconducting cuprates are best described as a nearly antiferromagnetic Fermi liquid. Its anomalous transport, optical and quasiparticle properties arise from the magnetic interaction between the quasiparticles which gives rise to a high T c transition to a superconducting state with d x 2 − y 2 symmetry now observed in nuclear magnetic resonance, penetration depth, SQUID and other tunneling experiments, Raman and neutron scattering, photoemission, and numerous other experiments. I discuss the influences of imperfections on both T c and the low-temperature properties, review experiments on dirty d-wave superconductors, and suggest a possible “intrinsic imperfection” hierarchy of cuprate superconductors.
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