Abstract
The universal anomalies in the normal state of Cu-O high-temperature
superconductors follow from a single hypothesis: There exist charge-
and spin-density excitations with the absorptive part of the polarizability
at low frequencies ω proportional to ω/T, where T is the temperature,
and constant otherwise. The behavior in such a situation may be characterized
as that of a marginal Fermi liquid. The consequences of this hypothesis
are worked out for a variety of physical properties including superconductivity.
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